diff --git a/drivers/staging/most/core.h b/drivers/staging/most/core.h
index 52db7fa15f65..74a29163b68a 100644
--- a/drivers/staging/most/core.h
+++ b/drivers/staging/most/core.h
@@ -232,7 +232,7 @@ struct most_interface {
 	struct module *mod;
 	enum most_interface_type interface;
 	const char *description;
-	int num_channels;
+	unsigned int num_channels;
 	struct most_channel_capability *channel_vector;
 	int (*configure)(struct most_interface *iface, int channel_idx,
 			 struct most_channel_config *channel_config);