diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index 8a023c0d73..ee09b48855 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -140,6 +140,7 @@ bool CBOINCGUIApp::OnInit() {
     m_strPasswordArg = wxEmptyString;
     m_iRPCPortArg = GUI_RPC_PORT;
     m_strBOINCArguments = wxEmptyString;
+    m_strISOLanguageID = wxEmptyString;
     m_bGUIVisible = true;
     m_bDebugSkins = false;
     m_bMultipleInstancesOK = false;
@@ -277,6 +278,7 @@ bool CBOINCGUIApp::OnInit() {
     m_pLocale = new wxLocale();
     wxASSERT(m_pLocale);
 
+    m_strISOLanguageID = m_pLocale->GetCanonicalName();
 
     // Look for the localization files by absolute and relative locations.
     //   preference given to the absolute location.
diff --git a/clientgui/BOINCGUIApp.h b/clientgui/BOINCGUIApp.h
index 411044e8cf..926f06a996 100644
--- a/clientgui/BOINCGUIApp.h
+++ b/clientgui/BOINCGUIApp.h
@@ -85,6 +85,7 @@ protected:
     wxString            m_strHostNameArg;
     wxString            m_strPasswordArg;
     wxString            m_strBOINCArguments;
+    wxString            m_strISOLanguageID;
     int                 m_iRPCPortArg;
 
     bool                m_bBOINCMGRAutoStarted;
@@ -156,6 +157,7 @@ public:
 
 
     wxArrayString&      GetSupportedLanguages()     { return m_astrLanguages; }
+    wxString            GetISOLanguageID()          { return m_strISOLanguageID; }
     
     void                DisplayEventLog(bool bShowWindow = true);
     void                OnEventLogClose();