diff --git a/src/Aircraft/flightrecorder.hxx b/src/Aircraft/flightrecorder.hxx
index 27270e7e6..8314912e9 100644
--- a/src/Aircraft/flightrecorder.hxx
+++ b/src/Aircraft/flightrecorder.hxx
@@ -86,7 +86,7 @@ private:
     FlightRecorder::TSignalList m_CaptureInt8;
     FlightRecorder::TSignalList m_CaptureBool;
 
-    int m_TotalRecordSize;
+    unsigned m_TotalRecordSize;
     std::string m_ConfigName;
     bool m_usingDefaultConfig;
     FGMultiplayMgr* m_MultiplayMgr;