diff --git a/net/sched/act_connmark.c b/net/sched/act_connmark.c
index eae07a2..ab80629 100644
--- a/net/sched/act_connmark.c
+++ b/net/sched/act_connmark.c
@@ -30,7 +30,7 @@
 
 #define CONNMARK_TAB_MASK     3
 
-static int connmark_net_id;
+static unsigned int connmark_net_id;
 static struct tc_action_ops act_connmark_ops;
 
 static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,