diff --git a/Here4/hwdef.dat b/Here4/hwdef.dat
index d65a2ef..5b2e775 100644
--- a/Here4/hwdef.dat
+++ b/Here4/hwdef.dat
@@ -135,7 +135,7 @@ define AP_INERTIALSENSOR_ENABLED 0
 define HAL_NO_MONITOR_THREAD
 
 PD11 GPS_TP1 OUTPUT LOW GPIO(5)
-#PD7  GPS_PPS INPUT FLOATING GPIO(6)
+PD7  GPS_PPS INPUT PULLUP GPIO(6)
 define CONFIGURE_PPS_PIN TRUE
 define HAL_GPIO_PPS 6