diff --git a/src/main.c b/src/main.c
index 007b76e..2ac4746 100644
--- a/src/main.c
+++ b/src/main.c
@@ -17,6 +17,7 @@
  */
 
 #include <stdlib.h>
+#include <limits.h>
 #include "conntrackd.h"
 #include "log.h"
 #include <sys/types.h>