diff --git a/titan.c b/titan.c
index 7f8e7ed..0206142 100644
--- a/titan.c
+++ b/titan.c
@@ -23,6 +23,7 @@
 #include <fcntl.h>
 #include <netdb.h>
 #include <poll.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>