diff --git a/src/gbm/main/gbm.c b/src/gbm/main/gbm.c
index b0cab5129a1..1cc0b9aea19 100644
--- a/src/gbm/main/gbm.c
+++ b/src/gbm/main/gbm.c
@@ -25,7 +25,6 @@
  *    Benjamin Franzke <benjaminfranzke@googlemail.com>
  */
 
-#define _BSD_SOURCE
 #define _DEFAULT_SOURCE
 
 #include <stddef.h>