diff --git a/builtin_object.go b/builtin_object.go
index 63d514c2..45551c52 100644
--- a/builtin_object.go
+++ b/builtin_object.go
@@ -281,7 +281,7 @@ func builtinObjectValues(call FunctionCall) Value {
 		})
 		return objectValue(call.runtime.newArrayOf(keys))
 	}
-	panic(call.runtime.panicTypeError("Object.Keys is nil"))
+	panic(call.runtime.panicTypeError("Object.Values is nil"))
 }
 
 func builtinObjectGetOwnPropertyNames(call FunctionCall) Value {