diff --git a/src/bee-dep.c b/src/bee-dep.c
index 05d34d7..230a6fa 100644
--- a/src/bee-dep.c
+++ b/src/bee-dep.c
@@ -24,6 +24,8 @@
 ** along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
 
+#define _GNU_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <sys/stat.h>