diff --git a/gfx/common/wayland_common.c b/gfx/common/wayland_common.c
index 9b4d578d13..4e9140e570 100644
--- a/gfx/common/wayland_common.c
+++ b/gfx/common/wayland_common.c
@@ -13,7 +13,10 @@
  *  If not, see <http://www.gnu.org/licenses/>.
  */
 
+#ifndef _GNU_SOURCE
 #define _GNU_SOURCE
+#endif
+
 #include <fcntl.h>
 #include <errno.h>
 #include <sys/mman.h>