diff --git a/packages/jsonrpc/src/ensure.ts b/packages/jsonrpc/src/ensure.ts
index 4487637..3dcec9f 100644
--- a/packages/jsonrpc/src/ensure.ts
+++ b/packages/jsonrpc/src/ensure.ts
@@ -27,5 +27,5 @@ export function getValidatorsForMethod<Context>(
   target: any,
   method: string,
 ): Array<Validate<Context>> {
-  return Reflect.getOwnMetadata(ensureKey, target, method) || []
+  return Reflect.getMetadata(ensureKey, target, method) || []
 }
diff --git a/packages/jsonrpc/src/jsonrpc.ts b/packages/jsonrpc/src/jsonrpc.ts
index 1b99a52..e0e69b0 100644
--- a/packages/jsonrpc/src/jsonrpc.ts
+++ b/packages/jsonrpc/src/jsonrpc.ts
@@ -108,7 +108,7 @@ export const createRpcService = <T, M extends FunctionPropertyNames<T>>(
       }
 
       const validators = getValidatorsForMethod<Context>(
-        (service as any).__proto__, method)
+        (service as any), method)
 
       validators.forEach(v => {
         const success = v(context)