diff --git a/drivers/hid/hid-steam.c b/drivers/hid/hid-steam.c
index 222b5751040a..ddd439dd069b 100644
--- a/drivers/hid/hid-steam.c
+++ b/drivers/hid/hid-steam.c
@@ -488,7 +488,7 @@ static int steam_get_serial(struct steam_device *steam)
 	 */
 	int ret = 0;
 	u8 cmd[] = {ID_GET_STRING_ATTRIBUTE, sizeof(steam->serial_no), ATTRIB_STR_UNIT_SERIAL};
-	u8 reply[3 + STEAM_SERIAL_LEN + 1];
+	u8 reply[3 + STEAM_SERIAL_LEN + 1] = {0};
 
 	guard(mutex)(&steam->report_mutex);
 	ret = steam_send_report(steam, cmd, sizeof(cmd));
@@ -503,7 +503,6 @@ static int steam_get_serial(struct steam_device *steam)
 				(int)sizeof(reply), reply);
 		return -EIO;
 	}
-	reply[3 + STEAM_SERIAL_LEN] = 0;
 	strscpy(steam->serial_no, reply + 3, reply[1]);
 	return ret;
 }