diff --git a/packages/fuels-macros/src/derive/utils.rs b/packages/fuels-macros/src/derive/utils.rs
index a0298f9c12..04407a63d4 100644
--- a/packages/fuels-macros/src/derive/utils.rs
+++ b/packages/fuels-macros/src/derive/utils.rs
@@ -60,10 +60,10 @@ pub(crate) fn extract_variants(
     contents: impl IntoIterator<Item = Variant>,
     fuels_core_path: TokenStream,
 ) -> Result<ExtractedVariants> {
-    let mut discriminant = 0;
     let variants = contents
         .into_iter()
-        .map(|variant| -> Result<_> {
+        .enumerate()
+        .map(|(discriminant, variant)| -> Result<_> {
             let is_unit = matches!(variant.fields, Fields::Unit);
             if has_ignore_attr(&variant.attrs) {
                 Ok(ExtractedVariant::Ignored {
@@ -75,15 +75,16 @@ pub(crate) fn extract_variants(
             } else {
                 validate_variant_type(&variant)?;
 
-                let current_discriminant = discriminant;
-                discriminant += 1;
+                let discriminant = discriminant.try_into().map_err(|_| {
+                    Error::new_spanned(&variant.ident, "Enums can not have more than 256 variants")
+                })?;
 
                 Ok(ExtractedVariant::Normal {
                     info: VariantInfo {
                         name: variant.ident,
                         is_unit,
                     },
-                    discriminant: current_discriminant,
+                    discriminant,
                 })
             }
         })
diff --git a/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.rs b/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.rs
new file mode 100644
index 0000000000..ba8f0244dd
--- /dev/null
+++ b/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.rs
@@ -0,0 +1,264 @@
+use fuels_macros::Tokenizable;
+
+#[derive(Tokenizable)]
+enum MaxedOutVariantsEnum {
+    Variant0(u8),
+    Variant1(u8),
+    Variant2(u8),
+    Variant3(u8),
+    Variant4(u8),
+    Variant5(u8),
+    Variant6(u8),
+    Variant7(u8),
+    Variant8(u8),
+    Variant9(u8),
+    Variant10(u8),
+    Variant11(u8),
+    Variant12(u8),
+    Variant13(u8),
+    Variant14(u8),
+    Variant15(u8),
+    Variant16(u8),
+    Variant17(u8),
+    Variant18(u8),
+    Variant19(u8),
+    Variant20(u8),
+    Variant21(u8),
+    Variant22(u8),
+    Variant23(u8),
+    Variant24(u8),
+    Variant25(u8),
+    Variant26(u8),
+    Variant27(u8),
+    Variant28(u8),
+    Variant29(u8),
+    Variant30(u8),
+    Variant31(u8),
+    Variant32(u8),
+    Variant33(u8),
+    Variant34(u8),
+    Variant35(u8),
+    Variant36(u8),
+    Variant37(u8),
+    Variant38(u8),
+    Variant39(u8),
+    Variant40(u8),
+    Variant41(u8),
+    Variant42(u8),
+    Variant43(u8),
+    Variant44(u8),
+    Variant45(u8),
+    Variant46(u8),
+    Variant47(u8),
+    Variant48(u8),
+    Variant49(u8),
+    Variant50(u8),
+    Variant51(u8),
+    Variant52(u8),
+    Variant53(u8),
+    Variant54(u8),
+    Variant55(u8),
+    Variant56(u8),
+    Variant57(u8),
+    Variant58(u8),
+    Variant59(u8),
+    Variant60(u8),
+    Variant61(u8),
+    Variant62(u8),
+    Variant63(u8),
+    Variant64(u8),
+    Variant65(u8),
+    Variant66(u8),
+    Variant67(u8),
+    Variant68(u8),
+    Variant69(u8),
+    Variant70(u8),
+    Variant71(u8),
+    Variant72(u8),
+    Variant73(u8),
+    Variant74(u8),
+    Variant75(u8),
+    Variant76(u8),
+    Variant77(u8),
+    Variant78(u8),
+    Variant79(u8),
+    Variant80(u8),
+    Variant81(u8),
+    Variant82(u8),
+    Variant83(u8),
+    Variant84(u8),
+    Variant85(u8),
+    Variant86(u8),
+    Variant87(u8),
+    Variant88(u8),
+    Variant89(u8),
+    Variant90(u8),
+    Variant91(u8),
+    Variant92(u8),
+    Variant93(u8),
+    Variant94(u8),
+    Variant95(u8),
+    Variant96(u8),
+    Variant97(u8),
+    Variant98(u8),
+    Variant99(u8),
+    Variant100(u8),
+    Variant101(u8),
+    Variant102(u8),
+    Variant103(u8),
+    Variant104(u8),
+    Variant105(u8),
+    Variant106(u8),
+    Variant107(u8),
+    Variant108(u8),
+    Variant109(u8),
+    Variant110(u8),
+    Variant111(u8),
+    Variant112(u8),
+    Variant113(u8),
+    Variant114(u8),
+    Variant115(u8),
+    Variant116(u8),
+    Variant117(u8),
+    Variant118(u8),
+    Variant119(u8),
+    Variant120(u8),
+    Variant121(u8),
+    Variant122(u8),
+    Variant123(u8),
+    Variant124(u8),
+    Variant125(u8),
+    Variant126(u8),
+    Variant127(u8),
+    Variant128(u8),
+    Variant129(u8),
+    Variant130(u8),
+    Variant131(u8),
+    Variant132(u8),
+    Variant133(u8),
+    Variant134(u8),
+    Variant135(u8),
+    Variant136(u8),
+    Variant137(u8),
+    Variant138(u8),
+    Variant139(u8),
+    Variant140(u8),
+    Variant141(u8),
+    Variant142(u8),
+    Variant143(u8),
+    Variant144(u8),
+    Variant145(u8),
+    Variant146(u8),
+    Variant147(u8),
+    Variant148(u8),
+    Variant149(u8),
+    Variant150(u8),
+    Variant151(u8),
+    Variant152(u8),
+    Variant153(u8),
+    Variant154(u8),
+    Variant155(u8),
+    Variant156(u8),
+    Variant157(u8),
+    Variant158(u8),
+    Variant159(u8),
+    Variant160(u8),
+    Variant161(u8),
+    Variant162(u8),
+    Variant163(u8),
+    Variant164(u8),
+    Variant165(u8),
+    Variant166(u8),
+    Variant167(u8),
+    Variant168(u8),
+    Variant169(u8),
+    Variant170(u8),
+    Variant171(u8),
+    Variant172(u8),
+    Variant173(u8),
+    Variant174(u8),
+    Variant175(u8),
+    Variant176(u8),
+    Variant177(u8),
+    Variant178(u8),
+    Variant179(u8),
+    Variant180(u8),
+    Variant181(u8),
+    Variant182(u8),
+    Variant183(u8),
+    Variant184(u8),
+    Variant185(u8),
+    Variant186(u8),
+    Variant187(u8),
+    Variant188(u8),
+    Variant189(u8),
+    Variant190(u8),
+    Variant191(u8),
+    Variant192(u8),
+    Variant193(u8),
+    Variant194(u8),
+    Variant195(u8),
+    Variant196(u8),
+    Variant197(u8),
+    Variant198(u8),
+    Variant199(u8),
+    Variant200(u8),
+    Variant201(u8),
+    Variant202(u8),
+    Variant203(u8),
+    Variant204(u8),
+    Variant205(u8),
+    Variant206(u8),
+    Variant207(u8),
+    Variant208(u8),
+    Variant209(u8),
+    Variant210(u8),
+    Variant211(u8),
+    Variant212(u8),
+    Variant213(u8),
+    Variant214(u8),
+    Variant215(u8),
+    Variant216(u8),
+    Variant217(u8),
+    Variant218(u8),
+    Variant219(u8),
+    Variant220(u8),
+    Variant221(u8),
+    Variant222(u8),
+    Variant223(u8),
+    Variant224(u8),
+    Variant225(u8),
+    Variant226(u8),
+    Variant227(u8),
+    Variant228(u8),
+    Variant229(u8),
+    Variant230(u8),
+    Variant231(u8),
+    Variant232(u8),
+    Variant233(u8),
+    Variant234(u8),
+    Variant235(u8),
+    Variant236(u8),
+    Variant237(u8),
+    Variant238(u8),
+    Variant239(u8),
+    Variant240(u8),
+    Variant241(u8),
+    Variant242(u8),
+    Variant243(u8),
+    Variant244(u8),
+    Variant245(u8),
+    Variant246(u8),
+    Variant247(u8),
+    Variant248(u8),
+    Variant249(u8),
+    Variant250(u8),
+    Variant251(u8),
+    Variant252(u8),
+    Variant253(u8),
+    Variant254(u8),
+    Variant255(u8),
+    Variant256(u8),
+}
+
+fn main() {}
diff --git a/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.stderr b/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.stderr
new file mode 100644
index 0000000000..0e8f7e02d9
--- /dev/null
+++ b/packages/fuels-macros/tests/ui/derive/tokenizable/enum_size_not_supported.stderr
@@ -0,0 +1,5 @@
+error: Enums can not have more than 256 variants
+   --> tests/ui/derive/tokenizable/enum_size_not_supported.rs:261:5
+    |
+261 |     Variant256(u8),
+    |     ^^^^^^^^^^
diff --git a/packages/fuels/tests/types/contracts/enum_as_input/src/main.sw b/packages/fuels/tests/types/contracts/enum_as_input/src/main.sw
index 8ee4cc9e77..f0d2f573cb 100644
--- a/packages/fuels/tests/types/contracts/enum_as_input/src/main.sw
+++ b/packages/fuels/tests/types/contracts/enum_as_input/src/main.sw
@@ -14,9 +14,271 @@ enum UnitEnum {
     Three: (),
 }
 
+#[allow(dead_code)]
+enum MaxedOutVariantsEnum {
+    Variant0: u8,
+    Variant1: u8,
+    Variant2: u8,
+    Variant3: u8,
+    Variant4: u8,
+    Variant5: u8,
+    Variant6: u8,
+    Variant7: u8,
+    Variant8: u8,
+    Variant9: u8,
+    Variant10: u8,
+    Variant11: u8,
+    Variant12: u8,
+    Variant13: u8,
+    Variant14: u8,
+    Variant15: u8,
+    Variant16: u8,
+    Variant17: u8,
+    Variant18: u8,
+    Variant19: u8,
+    Variant20: u8,
+    Variant21: u8,
+    Variant22: u8,
+    Variant23: u8,
+    Variant24: u8,
+    Variant25: u8,
+    Variant26: u8,
+    Variant27: u8,
+    Variant28: u8,
+    Variant29: u8,
+    Variant30: u8,
+    Variant31: u8,
+    Variant32: u8,
+    Variant33: u8,
+    Variant34: u8,
+    Variant35: u8,
+    Variant36: u8,
+    Variant37: u8,
+    Variant38: u8,
+    Variant39: u8,
+    Variant40: u8,
+    Variant41: u8,
+    Variant42: u8,
+    Variant43: u8,
+    Variant44: u8,
+    Variant45: u8,
+    Variant46: u8,
+    Variant47: u8,
+    Variant48: u8,
+    Variant49: u8,
+    Variant50: u8,
+    Variant51: u8,
+    Variant52: u8,
+    Variant53: u8,
+    Variant54: u8,
+    Variant55: u8,
+    Variant56: u8,
+    Variant57: u8,
+    Variant58: u8,
+    Variant59: u8,
+    Variant60: u8,
+    Variant61: u8,
+    Variant62: u8,
+    Variant63: u8,
+    Variant64: u8,
+    Variant65: u8,
+    Variant66: u8,
+    Variant67: u8,
+    Variant68: u8,
+    Variant69: u8,
+    Variant70: u8,
+    Variant71: u8,
+    Variant72: u8,
+    Variant73: u8,
+    Variant74: u8,
+    Variant75: u8,
+    Variant76: u8,
+    Variant77: u8,
+    Variant78: u8,
+    Variant79: u8,
+    Variant80: u8,
+    Variant81: u8,
+    Variant82: u8,
+    Variant83: u8,
+    Variant84: u8,
+    Variant85: u8,
+    Variant86: u8,
+    Variant87: u8,
+    Variant88: u8,
+    Variant89: u8,
+    Variant90: u8,
+    Variant91: u8,
+    Variant92: u8,
+    Variant93: u8,
+    Variant94: u8,
+    Variant95: u8,
+    Variant96: u8,
+    Variant97: u8,
+    Variant98: u8,
+    Variant99: u8,
+    Variant100: u8,
+    Variant101: u8,
+    Variant102: u8,
+    Variant103: u8,
+    Variant104: u8,
+    Variant105: u8,
+    Variant106: u8,
+    Variant107: u8,
+    Variant108: u8,
+    Variant109: u8,
+    Variant110: u8,
+    Variant111: u8,
+    Variant112: u8,
+    Variant113: u8,
+    Variant114: u8,
+    Variant115: u8,
+    Variant116: u8,
+    Variant117: u8,
+    Variant118: u8,
+    Variant119: u8,
+    Variant120: u8,
+    Variant121: u8,
+    Variant122: u8,
+    Variant123: u8,
+    Variant124: u8,
+    Variant125: u8,
+    Variant126: u8,
+    Variant127: u8,
+    Variant128: u8,
+    Variant129: u8,
+    Variant130: u8,
+    Variant131: u8,
+    Variant132: u8,
+    Variant133: u8,
+    Variant134: u8,
+    Variant135: u8,
+    Variant136: u8,
+    Variant137: u8,
+    Variant138: u8,
+    Variant139: u8,
+    Variant140: u8,
+    Variant141: u8,
+    Variant142: u8,
+    Variant143: u8,
+    Variant144: u8,
+    Variant145: u8,
+    Variant146: u8,
+    Variant147: u8,
+    Variant148: u8,
+    Variant149: u8,
+    Variant150: u8,
+    Variant151: u8,
+    Variant152: u8,
+    Variant153: u8,
+    Variant154: u8,
+    Variant155: u8,
+    Variant156: u8,
+    Variant157: u8,
+    Variant158: u8,
+    Variant159: u8,
+    Variant160: u8,
+    Variant161: u8,
+    Variant162: u8,
+    Variant163: u8,
+    Variant164: u8,
+    Variant165: u8,
+    Variant166: u8,
+    Variant167: u8,
+    Variant168: u8,
+    Variant169: u8,
+    Variant170: u8,
+    Variant171: u8,
+    Variant172: u8,
+    Variant173: u8,
+    Variant174: u8,
+    Variant175: u8,
+    Variant176: u8,
+    Variant177: u8,
+    Variant178: u8,
+    Variant179: u8,
+    Variant180: u8,
+    Variant181: u8,
+    Variant182: u8,
+    Variant183: u8,
+    Variant184: u8,
+    Variant185: u8,
+    Variant186: u8,
+    Variant187: u8,
+    Variant188: u8,
+    Variant189: u8,
+    Variant190: u8,
+    Variant191: u8,
+    Variant192: u8,
+    Variant193: u8,
+    Variant194: u8,
+    Variant195: u8,
+    Variant196: u8,
+    Variant197: u8,
+    Variant198: u8,
+    Variant199: u8,
+    Variant200: u8,
+    Variant201: u8,
+    Variant202: u8,
+    Variant203: u8,
+    Variant204: u8,
+    Variant205: u8,
+    Variant206: u8,
+    Variant207: u8,
+    Variant208: u8,
+    Variant209: u8,
+    Variant210: u8,
+    Variant211: u8,
+    Variant212: u8,
+    Variant213: u8,
+    Variant214: u8,
+    Variant215: u8,
+    Variant216: u8,
+    Variant217: u8,
+    Variant218: u8,
+    Variant219: u8,
+    Variant220: u8,
+    Variant221: u8,
+    Variant222: u8,
+    Variant223: u8,
+    Variant224: u8,
+    Variant225: u8,
+    Variant226: u8,
+    Variant227: u8,
+    Variant228: u8,
+    Variant229: u8,
+    Variant230: u8,
+    Variant231: u8,
+    Variant232: u8,
+    Variant233: u8,
+    Variant234: u8,
+    Variant235: u8,
+    Variant236: u8,
+    Variant237: u8,
+    Variant238: u8,
+    Variant239: u8,
+    Variant240: u8,
+    Variant241: u8,
+    Variant242: u8,
+    Variant243: u8,
+    Variant244: u8,
+    Variant245: u8,
+    Variant246: u8,
+    Variant247: u8,
+    Variant248: u8,
+    Variant249: u8,
+    Variant250: u8,
+    Variant251: u8,
+    Variant252: u8,
+    Variant253: u8,
+    Variant254: u8,
+    Variant255: u8,
+}
+
 abi EnumTesting {
     fn get_standard_enum() -> StandardEnum;
+
     fn check_standard_enum_integrity(arg: StandardEnum) -> bool;
+    fn get_max_variant() -> MaxedOutVariantsEnum;
 
     fn get_unit_enum() -> UnitEnum;
     fn check_unit_enum_integrity(arg: UnitEnum) -> bool;
@@ -37,6 +299,10 @@ impl EnumTesting for Contract {
         }
     }
 
+    fn get_max_variant() -> MaxedOutVariantsEnum {
+        MaxedOutVariantsEnum::Variant255(11)
+    }
+
     fn get_unit_enum() -> UnitEnum {
         UnitEnum::Two
     }
diff --git a/packages/fuels/tests/types_contracts.rs b/packages/fuels/tests/types_contracts.rs
index 9e51e71a4d..27cc7c47a7 100644
--- a/packages/fuels/tests/types_contracts.rs
+++ b/packages/fuels/tests/types_contracts.rs
@@ -669,6 +669,11 @@ async fn enum_as_input() -> Result<()> {
         ),
     );
 
+    let expected = MaxedOutVariantsEnum::Variant255(11);
+    let contract_methods = contract_instance.methods();
+    let actual = contract_methods.get_max_variant().call().await?.value;
+    assert_eq!(expected, actual);
+
     let expected = StandardEnum::Two(12345);
     let contract_methods = contract_instance.methods();
     let actual = contract_methods.get_standard_enum().call().await?.value;