diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c
index cfe4538304fb..312664155a54 100644
--- a/drivers/clk/sunxi-ng/ccu_mux.c
+++ b/drivers/clk/sunxi-ng/ccu_mux.c
@@ -68,7 +68,7 @@ unsigned long ccu_mux_helper_apply_prediv(struct ccu_common *common,
 	return parent_rate / ccu_mux_get_prediv(common, cm, parent_index);
 }
 
-unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common,
+static unsigned long ccu_mux_helper_unapply_prediv(struct ccu_common *common,
 					    struct ccu_mux_internal *cm,
 					    int parent_index,
 					    unsigned long parent_rate)