diff --git a/src.ts/abi/interface.ts b/src.ts/abi/interface.ts
index 1d42b4770..027255a4b 100644
--- a/src.ts/abi/interface.ts
+++ b/src.ts/abi/interface.ts
@@ -818,7 +818,7 @@ export class Interface {
             topics.push(eventFragment.topicHash);
         }
 
-        assertArgument(values.length !== eventFragment.inputs.length,
+        assertArgument(values.length === eventFragment.inputs.length,
             "event arguments/values mismatch", "values", values);
 
         eventFragment.inputs.forEach((param, index) => {