diff --git a/posix/JackSystemDeps_os.h b/posix/JackSystemDeps_os.h
index 41ee9528..516b805b 100644
--- a/posix/JackSystemDeps_os.h
+++ b/posix/JackSystemDeps_os.h
@@ -25,7 +25,9 @@ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 #include <signal.h>
 #include <dlfcn.h>
 
+#ifndef UINT32_MAX 
 #define UINT32_MAX 4294967295U
+#endif
 
 #define DRIVER_HANDLE void*
 #define LoadDriverModule(name) dlopen((name), RTLD_NOW | RTLD_GLOBAL)