diff --git a/src/mworker.c b/src/mworker.c
index 690f3f025..abdc1d389 100644
--- a/src/mworker.c
+++ b/src/mworker.c
@@ -10,6 +10,8 @@
  *
  */
 
+#define _GNU_SOURCE
+
 #include <errno.h>
 #include <fcntl.h>
 #include <signal.h>