diff --git a/Makefile.in b/Makefile.in
index 2eecb07c56..3778f0ceb6 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -11247,7 +11247,7 @@ monodll_gprint.o: $(srcdir)/src/gtk/gnome/gprint.cpp $(MONODLL_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@monodll_settings.o: $(srcdir)/src/mac/carbon/settings.cpp $(MONODLL_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(MONODLL_CXXFLAGS) $<
 
-@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@monodll_settings.o: $(srcdir)/src/cocoa/settings.cpp $(MONODLL_ODEP)
+@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@monodll_settings.o: $(srcdir)/src/cocoa/settings.mm $(MONODLL_ODEP)
 @COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(MONODLL_CXXFLAGS) $<
 
 @COND_TOOLKIT_PM_USE_GUI_1_WXUNIV_0@monodll_settings.o: $(srcdir)/src/os2/settings.cpp $(MONODLL_ODEP)
@@ -14574,7 +14574,7 @@ monolib_gprint.o: $(srcdir)/src/gtk/gnome/gprint.cpp $(MONOLIB_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@monolib_settings.o: $(srcdir)/src/mac/carbon/settings.cpp $(MONOLIB_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(MONOLIB_CXXFLAGS) $<
 
-@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@monolib_settings.o: $(srcdir)/src/cocoa/settings.cpp $(MONOLIB_ODEP)
+@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@monolib_settings.o: $(srcdir)/src/cocoa/settings.mm $(MONOLIB_ODEP)
 @COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(MONOLIB_CXXFLAGS) $<
 
 @COND_TOOLKIT_PM_USE_GUI_1_WXUNIV_0@monolib_settings.o: $(srcdir)/src/os2/settings.cpp $(MONOLIB_ODEP)
@@ -18225,7 +18225,7 @@ coredll_win32.o: $(srcdir)/src/univ/themes/win32.cpp $(COREDLL_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@coredll_settings.o: $(srcdir)/src/mac/carbon/settings.cpp $(COREDLL_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(COREDLL_CXXFLAGS) $<
 
-@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@coredll_settings.o: $(srcdir)/src/cocoa/settings.cpp $(COREDLL_ODEP)
+@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@coredll_settings.o: $(srcdir)/src/cocoa/settings.mm $(COREDLL_ODEP)
 @COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(COREDLL_CXXFLAGS) $<
 
 @COND_TOOLKIT_PM_USE_GUI_1_WXUNIV_0@coredll_settings.o: $(srcdir)/src/os2/settings.cpp $(COREDLL_ODEP)
@@ -20718,7 +20718,7 @@ corelib_win32.o: $(srcdir)/src/univ/themes/win32.cpp $(CORELIB_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@corelib_settings.o: $(srcdir)/src/mac/carbon/settings.cpp $(CORELIB_ODEP)
 @COND_TOOLKIT_MAC_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(CORELIB_CXXFLAGS) $<
 
-@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@corelib_settings.o: $(srcdir)/src/cocoa/settings.cpp $(CORELIB_ODEP)
+@COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@corelib_settings.o: $(srcdir)/src/cocoa/settings.mm $(CORELIB_ODEP)
 @COND_TOOLKIT_COCOA_USE_GUI_1_WXUNIV_0@	$(CXXC) -c -o $@ $(CORELIB_CXXFLAGS) $<
 
 @COND_TOOLKIT_PM_USE_GUI_1_WXUNIV_0@corelib_settings.o: $(srcdir)/src/os2/settings.cpp $(CORELIB_ODEP)
diff --git a/build/bakefiles/files.bkl b/build/bakefiles/files.bkl
index 4cee3f736d..6618b5e17c 100644
--- a/build/bakefiles/files.bkl
+++ b/build/bakefiles/files.bkl
@@ -2012,7 +2012,7 @@ IMPORTANT: please read docs/tech/tn0016.txt before modifying this file!
     src/cocoa/radiobut.mm
     src/cocoa/region.mm
     src/cocoa/scrolbar.mm
-    src/cocoa/settings.cpp
+    src/cocoa/settings.mm
     src/cocoa/slider.mm
     src/cocoa/sound.mm
     src/cocoa/spinbutt.mm
diff --git a/src/cocoa/settings.cpp b/src/cocoa/settings.mm
similarity index 100%
rename from src/cocoa/settings.cpp
rename to src/cocoa/settings.mm