diff --git a/Userland/Libraries/LibJS/Runtime/Completion.h b/Userland/Libraries/LibJS/Runtime/Completion.h
index 78e7bc8b87..6e3b64dc40 100644
--- a/Userland/Libraries/LibJS/Runtime/Completion.h
+++ b/Userland/Libraries/LibJS/Runtime/Completion.h
@@ -344,7 +344,7 @@ private:
 };
 
 template<>
-class ThrowCompletionOr<void> : public ThrowCompletionOr<Empty> {
+class [[nodiscard]] ThrowCompletionOr<void> : public ThrowCompletionOr<Empty> {
 public:
     using ThrowCompletionOr<Empty>::ThrowCompletionOr;
 };