diff --git a/misc/scripts/makeosxtags.sh b/misc/scripts/makeosxtags.sh
index dcb72f4768..1509eec6f9 100755
--- a/misc/scripts/makeosxtags.sh
+++ b/misc/scripts/makeosxtags.sh
@@ -3,6 +3,12 @@
 create_tags osx
 
 osx_port=${1-carbon}
+if [[ $osx_port = carbon ]]; then
+    ext=cpp
+else
+    ext=mm
+fi
+
 ctags --totals --c++-kinds=+px --language-force=c++ \
     -f osx_$osx_port.tags \
     -I @misc/scripts/ctags.ignore \
@@ -12,4 +18,4 @@ ctags --totals --c++-kinds=+px --language-force=c++ \
     include/wx/osx/$osx_port/*.h \
     include/wx/osx/$osx_port/private/*.h \
     src/osx/core/*.cpp \
-    src/osx/$osx_port/*.{cpp,mm}
+    src/osx/$osx_port/*.$ext