diff --git a/test/end2end/logging.cpp b/test/end2end/logging.cpp
index 4adb5af..d75625e 100644
--- a/test/end2end/logging.cpp
+++ b/test/end2end/logging.cpp
@@ -42,9 +42,10 @@
     }
 }
 
-void eventVital()
+uint32_t eventVital()
 {
     std::cout << "event: vital" << std::endl;
+    return 0;
 }
 
 } // namespace attn