diff --git a/net/can/isotp.c b/net/can/isotp.c
index df6968b28bf41e53a11eaf60a32e8817da54e05e..02cbcb2ecf0dbc58f458fd6127044113e4a368ba 100644
--- a/net/can/isotp.c
+++ b/net/can/isotp.c
@@ -119,8 +119,8 @@ enum {
 };
 
 struct tpcon {
-	int idx;
-	int len;
+	unsigned int idx;
+	unsigned int len;
 	u32 state;
 	u8 bs;
 	u8 sn;