diff --git a/res/res_monitor.c b/res/res_monitor.c
index 8137c874dd..56eaaf9561 100755
--- a/res/res_monitor.c
+++ b/res/res_monitor.c
@@ -17,6 +17,7 @@
 #include <asterisk/monitor.h>
 #include <asterisk/app.h>
 #include <asterisk/utils.h>
+#include <asterisk/config.h>
 #include "../asterisk.h"
 #include "../astconf.h"