diff --git a/res/res_parking.c b/res/res_parking.c
index ab9191c1ec..b7d1b22f98 100755
--- a/res/res_parking.c
+++ b/res/res_parking.c
@@ -26,6 +26,7 @@
 #include <asterisk/config.h>
 #include <asterisk/cli.h>
 #include <asterisk/manager.h>
+#include <asterisk/utils.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <unistd.h>