diff --git a/tests/thread/atomic.cpp b/tests/thread/atomic.cpp
index 1170093e44..9f7b01032c 100644
--- a/tests/thread/atomic.cpp
+++ b/tests/thread/atomic.cpp
@@ -195,5 +195,5 @@ void *AtomicTestCase::MyThread::Entry()
         }
     }
 
-    return (wxThread::ExitCode)negativeValuesSeen;
+    return wxUIntToPtr(negativeValuesSeen);
 }