diff --git a/packages/app-contracts/src/Call.tsx b/packages/app-contracts/src/Call.tsx
index 5817f40d80..2dd3acf9bd 100644
--- a/packages/app-contracts/src/Call.tsx
+++ b/packages/app-contracts/src/Call.tsx
@@ -166,7 +166,7 @@ class Call extends React.PureComponent<Props, State> {
   }
 
   private onChangeMethod = (method: string | null): void => {
-    this.setState({ method });
+    this.setState({ method, params: [] });
   }
 
   private onChangeParams = (params: Array<any>): void => {