diff --git a/drivers/ntb/hw/intel/ntb_hw_gen4.c b/drivers/ntb/hw/intel/ntb_hw_gen4.c
index 28fa0ab7b0fb..bc4541cbf8c6 100644
--- a/drivers/ntb/hw/intel/ntb_hw_gen4.c
+++ b/drivers/ntb/hw/intel/ntb_hw_gen4.c
@@ -456,7 +456,7 @@ static int intel_ntb4_link_enable(struct ntb_dev *ntb,
 	return 0;
 }
 
-int intel_ntb4_link_disable(struct ntb_dev *ntb)
+static int intel_ntb4_link_disable(struct ntb_dev *ntb)
 {
 	struct intel_ntb_dev *ndev;
 	u32 ntb_cntl;