diff --git a/drivers/video/fbdev/fsl-diu-fb.c b/drivers/video/fbdev/fsl-diu-fb.c
index 25abbcf38913..8bdd82f76056 100644
--- a/drivers/video/fbdev/fsl-diu-fb.c
+++ b/drivers/video/fbdev/fsl-diu-fb.c
@@ -489,7 +489,7 @@ static enum fsl_diu_monitor_port fsl_diu_name_to_port(const char *s)
  * Workaround for failed writing desc register of planes.
  * Needed with MPC5121 DIU rev 2.0 silicon.
  */
-void wr_reg_wa(u32 *reg, u32 val)
+static void wr_reg_wa(u32 *reg, u32 val)
 {
 	do {
 		out_be32(reg, val);