diff --git a/package/wprobe/src/user/wprobe-lib.c b/package/wprobe/src/user/wprobe-lib.c
index a1a52f2054..7ba67cfcb2 100644
--- a/package/wprobe/src/user/wprobe-lib.c
+++ b/package/wprobe/src/user/wprobe-lib.c
@@ -13,6 +13,8 @@
  * GNU General Public License for more details.
  */
 
+#define _ISOC99_SOURCE
+#define _BSD_SOURCE
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <stdio.h>