diff --git a/src/AirspaceManagement/AirspaceFlightPlanProvider.cc b/src/AirspaceManagement/AirspaceFlightPlanProvider.cc
index 434c5b8745a101ff3bc7791deda4b7a092c5dba7..a46bc19ab6b278235d9c5d1bb4928e9e87dc4271 100644
--- a/src/AirspaceManagement/AirspaceFlightPlanProvider.cc
+++ b/src/AirspaceManagement/AirspaceFlightPlanProvider.cc
@@ -41,7 +41,7 @@ AirspaceFlightInfo*
 AirspaceFlightModel::get(int index)
 {
     if (index < 0 || index >= _flightEntries.count()) {
-        return NULL;
+        return nullptr;
     }
     return _flightEntries[index];
 }