diff --git a/Common/OS.cpp b/Common/OS.cpp
index 44c5bdd931232d66cd9895a6ce584b0c97a415d6..2f2e4b9baea711659b4c0e1cb05e8723f556d11d 100644
--- a/Common/OS.cpp
+++ b/Common/OS.cpp
@@ -34,11 +34,6 @@
 #include <fstream>
 #endif
 
-#if defined(__APPLE__)
-#define RUSAGE_SELF      0
-#define RUSAGE_CHILDREN -1
-#endif
-
 #include "GmshMessage.h"
 
 #if defined(WIN32) && !defined(__CYGWIN__)