diff --git a/drivers/net/ethernet/sfc/siena.c b/drivers/net/ethernet/sfc/siena.c
index d8b052979b1bc..891e9fb6abeca 100644
--- a/drivers/net/ethernet/sfc/siena.c
+++ b/drivers/net/ethernet/sfc/siena.c
@@ -948,8 +948,8 @@ static int siena_mtd_probe(struct efx_nic *efx)
 
 #endif /* CONFIG_SFC_MTD */
 
-unsigned int siena_check_caps(const struct efx_nic *efx,
-			      u8 flag, u32 offset)
+static unsigned int siena_check_caps(const struct efx_nic *efx,
+				     u8 flag, u32 offset)
 {
 	/* Siena did not support MC_CMD_GET_CAPABILITIES */
 	return 0;