diff --git a/src/list.h b/src/list.h
index 1453b66..6874454 100644
--- a/src/list.h
+++ b/src/list.h
@@ -21,6 +21,7 @@
 #ifndef _PAC_LIST_H
 #define _PAC_LIST_H
 
+#include <limits.h>
 #define FREELIST(p) { list_free(p); p = NULL; }
 
 /* your average linked list */