diff --git a/src/registry/Registry.ts b/src/registry/Registry.ts
index f0f1cda2..729e558a 100644
--- a/src/registry/Registry.ts
+++ b/src/registry/Registry.ts
@@ -252,7 +252,7 @@ export class Registry {
 			POLKADOT_ASSET_HUB_SPEC_NAMES.includes(specName.toLowerCase()) ||
 			KUSAMA_ASSET_HUB_SPEC_NAMES.includes(specName.toLowerCase()) ||
 			WESTEND_ASSET_HUB_SPEC_NAMES.includes(specName.toLowerCase()) ||
-			ROCOCO_ASSET_HUB_SPEC_NAME.includes(specName.toLocaleLowerCase())
+			ROCOCO_ASSET_HUB_SPEC_NAME.includes(specName.toLowerCase())
 		) {
 			this.specNameToIdCache.set(specName, '1000');
 			return '1000';