diff --git a/lib/Init.cc b/lib/Init.cc
index cff43185..2f9619a9 100644
--- a/lib/Init.cc
+++ b/lib/Init.cc
@@ -331,8 +331,6 @@ void Grid_sa_signal_handler(int sig,siginfo_t *si,void * ptr)
   return;
 };
 
-
-#define _GNU_SOURCE
 #include <fenv.h>
 
 #ifdef __APPLE__