diff --git a/drivers/usb/early/xhci-dbc.c b/drivers/usb/early/xhci-dbc.c
index 6c0434100e38..b0c4071f0b16 100644
--- a/drivers/usb/early/xhci-dbc.c
+++ b/drivers/usb/early/xhci-dbc.c
@@ -871,7 +871,8 @@ static int xdbc_bulk_write(const char *bytes, int size)
 
 static void early_xdbc_write(struct console *con, const char *str, u32 n)
 {
-	static char buf[XDBC_MAX_PACKET];
+	/* static variables are zeroed, so buf is always NULL terminated */
+	static char buf[XDBC_MAX_PACKET + 1];
 	int chunk, ret;
 	int use_cr = 0;