diff --git a/drivers/staging/fbtft/fb_hx8340bn.c b/drivers/staging/fbtft/fb_hx8340bn.c
index 3939502..26a987a 100644
--- a/drivers/staging/fbtft/fb_hx8340bn.c
+++ b/drivers/staging/fbtft/fb_hx8340bn.c
@@ -108,7 +108,7 @@
 	return 0;
 }
 
-void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
+static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
 {
 	fbtft_par_dbg(DEBUG_SET_ADDR_WIN, par,
 		"%s(xs=%d, ys=%d, xe=%d, ye=%d)\n", __func__, xs, ys, xe, ye);