diff --git a/runtime/kusama/src/lib.rs b/runtime/kusama/src/lib.rs
index 4e7dca2c8b24..eab02c7b7cdd 100644
--- a/runtime/kusama/src/lib.rs
+++ b/runtime/kusama/src/lib.rs
@@ -832,7 +832,7 @@ sp_api::impl_runtime_apis! {
 		fn local_validation_data(id: parachain::Id) -> Option<parachain::LocalValidationData> {
 			Parachains::current_local_validation_data(&id)
 		}
-		fn parachain_code(id: parachain::Id) -> Option<Vec<u8>> {
+		fn parachain_code(id: parachain::Id) -> Option<parachain::ValidationCode> {
 			Parachains::parachain_code(&id)
 		}
 		fn get_heads(extrinsics: Vec<<Block as BlockT>::Extrinsic>)
diff --git a/runtime/polkadot/src/lib.rs b/runtime/polkadot/src/lib.rs
index 2a2b46c88be7..943d736a2e14 100644
--- a/runtime/polkadot/src/lib.rs
+++ b/runtime/polkadot/src/lib.rs
@@ -753,7 +753,7 @@ sp_api::impl_runtime_apis! {
 		fn local_validation_data(id: parachain::Id) -> Option<parachain::LocalValidationData> {
 			Parachains::current_local_validation_data(&id)
 		}
-		fn parachain_code(id: parachain::Id) -> Option<Vec<u8>> {
+		fn parachain_code(id: parachain::Id) -> Option<parachain::ValidationCode> {
 			Parachains::parachain_code(&id)
 		}
 		fn get_heads(extrinsics: Vec<<Block as BlockT>::Extrinsic>)
diff --git a/runtime/test-runtime/src/lib.rs b/runtime/test-runtime/src/lib.rs
index 0a291592272e..01f8be731848 100644
--- a/runtime/test-runtime/src/lib.rs
+++ b/runtime/test-runtime/src/lib.rs
@@ -540,7 +540,7 @@ sp_api::impl_runtime_apis! {
 		fn local_validation_data(id: parachain::Id) -> Option<parachain::LocalValidationData> {
 			Parachains::current_local_validation_data(&id)
 		}
-		fn parachain_code(id: parachain::Id) -> Option<Vec<u8>> {
+		fn parachain_code(id: parachain::Id) -> Option<parachain::ValidationCode> {
 			Parachains::parachain_code(&id)
 		}
 		fn get_heads(extrinsics: Vec<<Block as BlockT>::Extrinsic>)