diff --git a/src/plugins/simulator/flightgear/simulatorflightgear.cpp b/src/plugins/simulator/flightgear/simulatorflightgear.cpp
index d5af0a28f..c3179cf99 100644
--- a/src/plugins/simulator/flightgear/simulatorflightgear.cpp
+++ b/src/plugins/simulator/flightgear/simulatorflightgear.cpp
@@ -156,17 +156,17 @@ namespace BlackSimPlugin
         }
 
         // convert flightgear squawk mode to swift squawk mode
-        CTransponder::TransponderMode xpdrMode(int xplaneMode, bool ident)
+        CTransponder::TransponderMode xpdrMode(int transponderMode, bool ident)
         {
             if (ident) { return CTransponder::StateIdent; }
-            if (xplaneMode == 0 || xplaneMode == 1) { return CTransponder::StateStandby; }
+            if (transponderMode == 0 || transponderMode == 1 || transponderMode == 2) { return CTransponder::StateStandby; }
             return CTransponder::ModeC;
         }
 
         // convert swift squawk mode to flightgear squawk mode
         int xpdrMode(CTransponder::TransponderMode mode)
         {
-            return mode == CTransponder::StateStandby ? 1 : 2;
+            return mode == CTransponder::StateStandby ? 1 : 4;
         }
 
         void CSimulatorFlightgear::fastTimerTimeout()
diff --git a/src/plugins/simulator/flightgear/simulatorflightgear.h b/src/plugins/simulator/flightgear/simulatorflightgear.h
index be42b52ee..5e47c731d 100644
--- a/src/plugins/simulator/flightgear/simulatorflightgear.h
+++ b/src/plugins/simulator/flightgear/simulatorflightgear.h
@@ -86,7 +86,7 @@ namespace BlackSimPlugin
             int com2ActiveKhz;                  //!< COM2 active [kHz]
             int com2StandbyKhz;                 //!< COM2 standby [kHz]
             int xpdrCode;                       //!< Transpondder code
-            int xpdrMode;                       //!< Transponder mode (off=0,stdby=1,on=2,test=3)
+            int xpdrMode;                       //!< Transponder mode (off=0,stdby=1-2, >2 on)
             bool xpdrIdent;                     //!< Is transponder in ident?
             bool beaconLightsOn;                //!< Beacon lights on?
             bool landingLightsOn;               //!< Landing lights on?