diff --git a/checkin_notes b/checkin_notes
index 299e90309a..51d6f7d713 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -8479,3 +8479,10 @@ Charlie 14 Nov 2011
     clientgui/
         sg_BoincSimpleFrame.cpp
         sg_TaskPanel.cpp,.h
+
+Charlie 9 Nov 2011
+    - MGR: Limit change of 9 November to only Debug builds: accept and 
+        ignore command line argument "-NSDocumentRevisionsDebugMode=YES"
+
+    clientgui/
+        BOINCGUIApp.cpp
diff --git a/clientgui/BOINCGUIApp.cpp b/clientgui/BOINCGUIApp.cpp
index c3c83bbc7e..28d5d556b6 100644
--- a/clientgui/BOINCGUIApp.cpp
+++ b/clientgui/BOINCGUIApp.cpp
@@ -515,7 +515,7 @@ void CBOINCGUIApp::OnInitCmdLine(wxCmdLineParser &parser) {
         { wxCMD_LINE_SWITCH, wxT("i"), wxT("insecure"), _("disable BOINC security users and permissions")},
         { wxCMD_LINE_SWITCH, wxT("c"), wxT("checkskins"), _("set skin debugging mode to enable skin manager error messages")},
         { wxCMD_LINE_SWITCH, wxT("m"), wxT("multiple"), _("multiple instances of BOINC Manager allowed")},
-#ifdef __WXMAC__
+#if (defined(__WXMAC__) && defined(_DEBUG))
         { wxCMD_LINE_OPTION, wxT("NSDocumentRevisionsDebugMode"), NULL, _("Not used: workaround for bug in XCode 4.2")},
 #endif
         { wxCMD_LINE_NONE}  //DON'T forget this line!!