diff --git a/src/GPS/GPSManager.cc b/src/GPS/GPSManager.cc
index 4eea19b8e08e476d02598f3b6b0751d75e871f40..c4b350cdbf98c3c7a425e34e14cfd349a5744477 100644
--- a/src/GPS/GPSManager.cc
+++ b/src/GPS/GPSManager.cc
@@ -84,8 +84,8 @@ void GPSManager::disconnectGPS(void)
     if (_rtcmMavlink) {
         delete(_rtcmMavlink);
     }
-    _gpsProvider = NULL;
-    _rtcmMavlink = NULL;
+    _gpsProvider = nullptr;
+    _rtcmMavlink = nullptr;
 }