diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c
index 2857d3f68730..0d027b10fbb3 100644
--- a/drivers/gpu/drm/rockchip/cdn-dp-core.c
+++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c
@@ -48,7 +48,7 @@ struct cdn_dp_data {
 	u8 max_phy;
 };
 
-struct cdn_dp_data rk3399_cdn_dp = {
+static struct cdn_dp_data rk3399_cdn_dp = {
 	.max_phy = 2,
 };