diff --git a/sink/sink20169.c b/sink/sink20169.c
index a83b954..7851ee1 100644
--- a/sink/sink20169.c
+++ b/sink/sink20169.c
@@ -1,3 +1,5 @@
+#define _DEFAULT_SOURCE
+
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
@@ -6,6 +8,7 @@
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <string.h>
+#include <getopt.h>
 
 #include <libconfig.h>
 #include <curl/curl.h>