diff --git a/drivers/thunderbolt/nhi.c b/drivers/thunderbolt/nhi.c
index b409c2c3b2c4..ee29c803708c 100644
--- a/drivers/thunderbolt/nhi.c
+++ b/drivers/thunderbolt/nhi.c
@@ -43,7 +43,7 @@
 #define QUIRK_AUTO_CLEAR_INT	BIT(0)
 #define QUIRK_E2E		BIT(1)
 
-static int ring_interrupt_index(struct tb_ring *ring)
+static int ring_interrupt_index(const struct tb_ring *ring)
 {
 	int bit = ring->hop;
 	if (!ring->is_tx)