diff --git a/.changeset/tender-cherries-hammer.md b/.changeset/tender-cherries-hammer.md
new file mode 100644
index 0000000000..0cf0459c20
--- /dev/null
+++ b/.changeset/tender-cherries-hammer.md
@@ -0,0 +1,6 @@
+---
+"@latticexyz/world-modules": patch
+"@latticexyz/world": patch
+---
+
+Replaced the `systemId` field in the `Unstable_CallWithSignatureSystem` typehash with individual `systemNamespace` and `systemName` string fields.
diff --git a/e2e/packages/sync-test/registerDelegationWithSignature.test.ts b/e2e/packages/sync-test/registerDelegationWithSignature.test.ts
index b12a46791b..810949d8f9 100644
--- a/e2e/packages/sync-test/registerDelegationWithSignature.test.ts
+++ b/e2e/packages/sync-test/registerDelegationWithSignature.test.ts
@@ -86,7 +86,8 @@ describe("callWithSignature", async () => {
       primaryType: "Call",
       message: {
         signer: delegator.address,
-        systemId,
+        systemNamespace: "",
+        systemName: "Registration",
         callData,
         nonce,
       },
diff --git a/packages/world-modules/gas-report.json b/packages/world-modules/gas-report.json
index 2b9a55876e..853c07d2d5 100644
--- a/packages/world-modules/gas-report.json
+++ b/packages/world-modules/gas-report.json
@@ -9,7 +9,7 @@
     "file": "test/CallWithSignatureModule.t.sol",
     "test": "testRegisterDelegationWithSignature",
     "name": "register an unlimited delegation with signature",
-    "gasUsed": 133659
+    "gasUsed": 135913
   },
   {
     "file": "test/ERC20.t.sol",
diff --git a/packages/world-modules/src/modules/callwithsignature/getSignedMessageHash.sol b/packages/world-modules/src/modules/callwithsignature/getSignedMessageHash.sol
index 46a42fe5f9..02a44fe2bf 100644
--- a/packages/world-modules/src/modules/callwithsignature/getSignedMessageHash.sol
+++ b/packages/world-modules/src/modules/callwithsignature/getSignedMessageHash.sol
@@ -2,12 +2,17 @@
 pragma solidity >=0.8.24;
 
 import { ResourceId } from "@latticexyz/store/src/ResourceId.sol";
+import { WorldResourceIdLib, WorldResourceIdInstance } from "@latticexyz/world/src/WorldResourceId.sol";
+
+using WorldResourceIdInstance for ResourceId;
 
 // Note the intended value of the `salt` field is the chain ID.
 // It is not included in `chainId`, to allow cross-chain signing without requiring wallets to switch networks.
 // The value of this field should be the chain on which the world lives, rather than the chain the wallet is connected to.
 bytes32 constant DOMAIN_TYPEHASH = keccak256("EIP712Domain(address verifyingContract,bytes32 salt)");
-bytes32 constant CALL_TYPEHASH = keccak256("Call(address signer,bytes32 systemId,bytes callData,uint256 nonce)");
+bytes32 constant CALL_TYPEHASH = keccak256(
+  "Call(address signer,string systemNamespace,string systemName,bytes callData,uint256 nonce)"
+);
 
 /**
  * @notice Generate the message hash for a given delegation signature.
@@ -34,7 +39,16 @@ function getSignedMessageHash(
       abi.encodePacked(
         "\x19\x01",
         domainSeperator,
-        keccak256(abi.encode(CALL_TYPEHASH, signer, systemId, keccak256(callData), nonce))
+        keccak256(
+          abi.encode(
+            CALL_TYPEHASH,
+            signer,
+            keccak256(abi.encodePacked(WorldResourceIdLib.toTrimmedString(systemId.getNamespace()))),
+            keccak256(abi.encodePacked(WorldResourceIdLib.toTrimmedString(systemId.getName()))),
+            keccak256(callData),
+            nonce
+          )
+        )
       )
     );
 }
diff --git a/packages/world-modules/test/CallWithSignatureModule.t.sol b/packages/world-modules/test/CallWithSignatureModule.t.sol
index 1d2b74a36f..42d4a68a24 100644
--- a/packages/world-modules/test/CallWithSignatureModule.t.sol
+++ b/packages/world-modules/test/CallWithSignatureModule.t.sol
@@ -104,7 +104,7 @@ contract Unstable_CallWithSignatureModuleTest is Test, GasReporter {
     vm.expectRevert(
       abi.encodeWithSelector(
         IUnstable_CallWithSignatureErrors.InvalidSignature.selector,
-        0x5266996Bb73ce3ac0E75D79Db87f4a96063cEe1F
+        0x65F0D93280688178Ec3F55bBd6f6088290639Bfb
       )
     );
     Unstable_CallWithSignatureSystem(address(world)).callWithSignature(
diff --git a/packages/world/ts/callWithSignatureTypes.ts b/packages/world/ts/callWithSignatureTypes.ts
index 6c16828081..c9a22550fc 100644
--- a/packages/world/ts/callWithSignatureTypes.ts
+++ b/packages/world/ts/callWithSignatureTypes.ts
@@ -3,7 +3,8 @@
 export const callWithSignatureTypes = {
   Call: [
     { name: "signer", type: "address" },
-    { name: "systemId", type: "bytes32" },
+    { name: "systemNamespace", type: "string" },
+    { name: "systemName", type: "string" },
     { name: "callData", type: "bytes" },
     { name: "nonce", type: "uint256" },
   ],