diff --git a/libraries/AP_GPS/AP_GPS_UBLOX.cpp b/libraries/AP_GPS/AP_GPS_UBLOX.cpp
index 51506383ba..3c5987f35f 100644
--- a/libraries/AP_GPS/AP_GPS_UBLOX.cpp
+++ b/libraries/AP_GPS/AP_GPS_UBLOX.cpp
@@ -36,7 +36,9 @@
 
 #define UBLOX_DEBUGGING 0
 #define UBLOX_FAKE_3DLOCK 0
+#ifndef CONFIGURE_PPS_PIN
 #define CONFIGURE_PPS_PIN 0
+#endif
 
 // this is number of epochs per output. A higher value will reduce
 // the uart bandwidth needed and allow for higher latency