diff --git a/mesh/mesh-io.c b/mesh/mesh-io.c
index 5cdfdc5..8cf6c48 100644
--- a/mesh/mesh-io.c
+++ b/mesh/mesh-io.c
@@ -177,7 +177,8 @@ bool mesh_io_send(struct mesh_io *io, struct mesh_io_send_info *info,
 	return false;
 }
 
-bool mesh_io_send_cancel(struct mesh_io *io, uint8_t *pattern, uint8_t len)
+bool mesh_io_send_cancel(struct mesh_io *io, const uint8_t *pattern,
+								uint8_t len)
 {
 	io = l_queue_find(io_list, match_by_io, io);
 
diff --git a/mesh/mesh-io.h b/mesh/mesh-io.h
index 754f612..71d3cb9 100644
--- a/mesh/mesh-io.h
+++ b/mesh/mesh-io.h
@@ -96,4 +96,5 @@ bool mesh_set_filter(struct mesh_io *io, uint8_t filter_id,
 
 bool mesh_io_send(struct mesh_io *io, struct mesh_io_send_info *info,
 					const uint8_t *data, uint16_t len);
-bool mesh_io_send_cancel(struct mesh_io *io, uint8_t *pattern, uint8_t len);
+bool mesh_io_send_cancel(struct mesh_io *io, const uint8_t *pattern,
+								uint8_t len);