diff --git a/engine/test/components/test_assistant.cc b/engine/test/components/test_assistant.cc
index 3b55011be..20ba08f34 100644
--- a/engine/test/components/test_assistant.cc
+++ b/engine/test/components/test_assistant.cc
@@ -42,7 +42,7 @@ TEST_F(AssistantTest, FullAssistantToJson) {
   // Add metadata
   base_assistant.metadata["key1"] = std::string("value1");
   base_assistant.metadata["key2"] = true;
-  base_assistant.metadata["key3"] = 42ULL;
+  base_assistant.metadata["key3"] = static_cast<uint64_t>(42ULL);
   
   auto result = base_assistant.ToJson();
   ASSERT_TRUE(result.has_value());