diff --git a/monitor_wrap.c b/monitor_wrap.c
index 431b3e4..3865539 100644
--- a/monitor_wrap.c
+++ b/monitor_wrap.c
@@ -33,6 +33,7 @@
 #include <errno.h>
 #include <pwd.h>
 #include <signal.h>
+#include <stdarg.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>