diff --git a/src/plugins/simulator/xplane/simulatorxplane.cpp b/src/plugins/simulator/xplane/simulatorxplane.cpp
index 80e8f0e8c..1722a6af5 100644
--- a/src/plugins/simulator/xplane/simulatorxplane.cpp
+++ b/src/plugins/simulator/xplane/simulatorxplane.cpp
@@ -366,7 +366,7 @@ namespace BlackSimPlugin
                 }
 
                 // FPS
-                if ((m_slowTimerCalls % 5) == 0)
+                if ((m_slowTimerCalls % 5u) == 0u)
                 {
                     // reading FPS resets average, so we only monitor over some time
                     m_serviceProxy->getFrameStats(&m_averageFps, &m_simTimeRatio);
diff --git a/src/plugins/simulator/xplane/simulatorxplane.h b/src/plugins/simulator/xplane/simulatorxplane.h
index 62501f6ba..49307b8f1 100644
--- a/src/plugins/simulator/xplane/simulatorxplane.h
+++ b/src/plugins/simulator/xplane/simulatorxplane.h
@@ -250,8 +250,8 @@ namespace BlackSimPlugin
             QTimer m_slowTimer;
             QTimer m_airportUpdater;
             QTimer m_pendingAddedTimer;
-            int m_fastTimerCalls = 0; //!< how often called
-            int m_slowTimerCalls = 0; //!< how often called
+            unsigned int m_fastTimerCalls = 0; //!< how often called
+            unsigned int m_slowTimerCalls = 0; //!< how often called
 
             BlackMisc::Aviation::CAirportList m_airportsInRange; //!< aiports in range of own aircraft
             BlackMisc::Simulation::CSimulatedAircraftList m_pendingToBeAddedAircraft; //!< aircraft to be added