diff --git a/packages/types/src/utils/typeguards.ts b/packages/types/src/utils/typeguards.ts
index a41b45eec546..1922cc3db2ce 100644
--- a/packages/types/src/utils/typeguards.ts
+++ b/packages/types/src/utils/typeguards.ts
@@ -68,8 +68,8 @@ export function isSignedBlockContents<F extends ForkBlobs>(
   return (data as SignedBlockContents<F>).kzgProofs !== undefined;
 }
 
-export function isElectraAttestation<F extends ForkName.electra>(
+export function isElectraAttestation(
   attestation: Attestation
-): attestation is Attestation<F> {
+): attestation is Attestation<ForkPostElectra> {
   return (attestation as Attestation<F>).committeeBits !== undefined;
 }