diff --git a/src/plugins/simulator/fs9/simulator_fs9.cpp b/src/plugins/simulator/fs9/simulator_fs9.cpp
index a54c4fd68..36ecfdd27 100644
--- a/src/plugins/simulator/fs9/simulator_fs9.cpp
+++ b/src/plugins/simulator/fs9/simulator_fs9.cpp
@@ -135,7 +135,7 @@ namespace BlackSimPlugin
 
         CCallsignSet CSimulatorFs9::physicallyRenderedAircraft() const
         {
-            return this->m_hashFs9Clients.keys();
+            return CCollection<CCallsign>(this->m_hashFs9Clients.keys());
         }
 
         bool CSimulatorFs9::updateOwnSimulatorCockpit(const CAircraft &ownAircraft, const QString &originator)
diff --git a/src/plugins/simulator/fsx/simulator_fsx.cpp b/src/plugins/simulator/fsx/simulator_fsx.cpp
index 7c884611a..19011d375 100644
--- a/src/plugins/simulator/fsx/simulator_fsx.cpp
+++ b/src/plugins/simulator/fsx/simulator_fsx.cpp
@@ -298,7 +298,7 @@ namespace BlackSimPlugin
 
         CCallsignSet CSimulatorFsx::physicallyRenderedAircraft() const
         {
-            return this->m_simConnectObjects.keys();
+            return CCollection<CCallsign>(this->m_simConnectObjects.keys());
         }
 
         void CSimulatorFsx::onSimRunning()