diff --git a/drivers/input/touchscreen/nt36xxx/nt36xxx_mp_ctrlram.c b/drivers/input/touchscreen/nt36xxx/nt36xxx_mp_ctrlram.c
index c14b0c86b906..94ece63c82d7 100644
--- a/drivers/input/touchscreen/nt36xxx/nt36xxx_mp_ctrlram.c
+++ b/drivers/input/touchscreen/nt36xxx/nt36xxx_mp_ctrlram.c
@@ -1093,7 +1093,7 @@ static int32_t nvt_selftest_open(struct inode *inode, struct file *file)
 		 * Ex. nvt_pid = 500A
 		 *     mpcriteria = "novatek-mp-criteria-500A"
 		 */
-		snprintf(mpcriteria, PAGE_SIZE, "novatek-mp-criteria-%04X", ts->nvt_pid);
+		snprintf(mpcriteria, sizeof(mpcriteria), "novatek-mp-criteria-%04X", ts->nvt_pid);
 
 		if (nvt_mp_parse_dt(np, mpcriteria)) {
 			mutex_unlock(&ts->lock);