diff --git a/src/mac/carbon/thread.cpp b/src/mac/carbon/thread.cpp
index e5fad666e6..c82ee0c1a6 100644
--- a/src/mac/carbon/thread.cpp
+++ b/src/mac/carbon/thread.cpp
@@ -138,8 +138,8 @@ void wxCriticalSection::Leave()
 
 #if TARGET_API_MAC_OSX
 #define wxUSE_MAC_SEMAPHORE_MUTEX 0
-#define wxUSE_MAC_CRITICAL_REGION_MUTEX 1
-#define wxUSE_MAC_PTHREADS_MUTEX 0
+#define wxUSE_MAC_CRITICAL_REGION_MUTEX 0
+#define wxUSE_MAC_PTHREADS_MUTEX 1
 #else
 #define wxUSE_MAC_SEMAPHORE_MUTEX 0
 #define wxUSE_MAC_CRITICAL_REGION_MUTEX 1