diff --git a/etherparse/src/transport/icmpv6_header.rs b/etherparse/src/transport/icmpv6_header.rs
index 1a2763bd..f5d33468 100644
--- a/etherparse/src/transport/icmpv6_header.rs
+++ b/etherparse/src/transport/icmpv6_header.rs
@@ -214,6 +214,7 @@ mod test {
     }
 
     proptest! {
+        #[cfg(not(target_pointer_width = "32"))]
         #[test]
         fn with_checksum(
             ip_header in ipv6_any(),
@@ -390,6 +391,7 @@ mod test {
 
     proptest! {
         #[test]
+        #[cfg(not(target_pointer_width = "32"))]
         fn update_checksum(
             ip_header in ipv6_any(),
             icmp_type in icmpv6_type_any(),
diff --git a/etherparse/src/transport/icmpv6_type.rs b/etherparse/src/transport/icmpv6_type.rs
index ff2e63be..9d246aa5 100644
--- a/etherparse/src/transport/icmpv6_type.rs
+++ b/etherparse/src/transport/icmpv6_type.rs
@@ -602,6 +602,7 @@ mod test {
 
     proptest! {
         #[test]
+        #[cfg(not(target_pointer_width = "32"))]
         fn calc_checksum(
             ip_header in ipv6_any(),
             icmpv6_type in icmpv6_type_any(),
@@ -714,6 +715,7 @@ mod test {
 
     proptest! {
         #[test]
+        #[cfg(not(target_pointer_width = "32"))]
         fn to_header(
             ip_header in ipv6_any(),
             icmpv6_type in icmpv6_type_any(),