diff --git a/src/blackcore/airspacemonitor.cpp b/src/blackcore/airspacemonitor.cpp
index 3622fc5a0..f491ea895 100644
--- a/src/blackcore/airspacemonitor.cpp
+++ b/src/blackcore/airspacemonitor.cpp
@@ -868,7 +868,7 @@ namespace BlackCore
         QPointer<CAirspaceMonitor> myself(this);
         for (const CSimulatedAircraft &ac : aircraft)
         {
-            QTimer::singleShot(c * 25, this, [ = ]
+            QTimer::singleShot(c++ * 25, this, [ = ]
             {
                 if (!myself) { return; }
                 myself->addNewAircraftInRange(ac);