diff --git a/src/blackmisc/simulation/backgroundvalidation.cpp b/src/blackmisc/simulation/backgroundvalidation.cpp
index 628ea5984..2a59b9468 100644
--- a/src/blackmisc/simulation/backgroundvalidation.cpp
+++ b/src/blackmisc/simulation/backgroundvalidation.cpp
@@ -35,10 +35,11 @@ namespace BlackMisc
             m_updateTimer.setInterval(60 * 1000);
         }
 
-        void CBackgroundValidation::setCurrentSimulator(const CSimulatorInfo &simulator)
+        void CBackgroundValidation::setCurrentSimulator(const CSimulatorInfo &simulator, const QString &simDirectory)
         {
             QWriteLocker l(&m_lock);
-            m_simulator = simulator;
+            m_simulator    = simulator;
+            m_simDirectory = simDirectory;
         }
 
         bool CBackgroundValidation::wasAlreadyChecked(const CSimulatorInfo &simulator) const
@@ -130,7 +131,7 @@ namespace BlackMisc
                     msgs.push_back(CStatusMessage(this, CStatusMessage::SeverityWarning, QStringLiteral("No models in set for  '%1'").arg(simulator.toQString(true))));
                     break;
                 }
-                msgs = CAircraftModelUtilities::validateModelFiles(models, valid, invalid, false, 25, wasStopped);
+                msgs = CAircraftModelUtilities::validateModelFiles(models, valid, invalid, false, 25, wasStopped, m_simDirectory);
 
                 const qint64 now = QDateTime::currentMSecsSinceEpoch();
                 const qint64 deltaTimeMs = now - started;
diff --git a/src/blackmisc/simulation/backgroundvalidation.h b/src/blackmisc/simulation/backgroundvalidation.h
index 63cf7e390..490a67e3a 100644
--- a/src/blackmisc/simulation/backgroundvalidation.h
+++ b/src/blackmisc/simulation/backgroundvalidation.h
@@ -41,7 +41,7 @@ namespace BlackMisc
 
             //! Corresponding simulator
             //! \threadsafe
-            void setCurrentSimulator(const CSimulatorInfo &simulator);
+            void setCurrentSimulator(const CSimulatorInfo &simulator, const QString &simDirectory);
 
             //! Was already checked for simulator?
             //! \threadsafe
@@ -76,9 +76,10 @@ namespace BlackMisc
             void validated(const CSimulatorInfo &simulator, const CAircraftModelList &validModels, const CAircraftModelList &invalidModels, bool stopped, const CStatusMessageList &msgs);
 
         private:
-            mutable QReadWriteLock m_lock;       //!< lock snapshot
-            std::atomic_bool m_inWork { false }; //!< indicates a running update
-            CSimulatorInfo m_simulator;
+            mutable QReadWriteLock m_lock;        //!< lock snapshot
+            std::atomic_bool m_inWork { false };  //!< indicates a running update
+            CSimulatorInfo   m_simulator;         //!< simulator
+            QString          m_simDirectory;      //!< corresponding sim directory
 
             // last result values, mostly needed when running in the distributed swift system and we want to get the values
             CAircraftModelList m_lastResultValid;