diff --git a/libraries/AP_GPS/examples/GPS_MTK_test/GPS_MTK_test.pde b/libraries/AP_GPS/examples/GPS_MTK_test/GPS_MTK_test.pde
index f26c99b687..0e4313d5d1 100644
--- a/libraries/AP_GPS/examples/GPS_MTK_test/GPS_MTK_test.pde
+++ b/libraries/AP_GPS/examples/GPS_MTK_test/GPS_MTK_test.pde
@@ -12,7 +12,7 @@
 FastSerialPort0(Serial);
 FastSerialPort1(Serial1);
 
-AP_GPS_MTK gps(&Serial);
+AP_GPS_MTK gps(&Serial1);
 #define T6 1000000
 #define T7 10000000