diff --git a/src/mac/carbon/thread.cpp b/src/mac/carbon/thread.cpp
index b747d70922..e5fad666e6 100644
--- a/src/mac/carbon/thread.cpp
+++ b/src/mac/carbon/thread.cpp
@@ -829,7 +829,7 @@ wxCondError wxConditionInternal::WaitTimeout( unsigned long milliseconds )
 
     wxSemaError err = m_semaphore.WaitTimeout(milliseconds);
 
-    if ( err == wxSEMA_BUSY )
+    if ( err == wxSEMA_TIMEOUT )
     {
         // another potential race condition exists here it is caused when a
         // 'waiting' thread timesout, and returns from WaitForSingleObject, but