diff --git a/include/net/flow.h b/include/net/flow.h
index 1ae901f..f4270d4 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -112,7 +112,8 @@
 extern void flow_cache_flush(void);
 extern atomic_t flow_cache_genid;
 
-static inline int flow_cache_uli_match(struct flowi *fl1, struct flowi *fl2)
+static inline int flow_cache_uli_match(const struct flowi *fl1,
+				       const struct flowi *fl2)
 {
 	return (fl1->proto == fl2->proto &&
 		!memcmp(&fl1->uli_u, &fl2->uli_u, sizeof(fl1->uli_u)));