diff --git a/src/osal.h b/src/osal.h
index 7b4b23dd..7efb3c06 100644
--- a/src/osal.h
+++ b/src/osal.h
@@ -114,7 +114,6 @@
 #include <mach/mach_host.h>
 #include <mach/mach_port.h>
 #include <uuid/uuid.h>
-#undef P_DIRTY
 #endif
 
 #if defined(__linux__) || defined(__gnu_linux__)