diff --git a/editorconfig-conf-mode.el b/editorconfig-conf-mode.el
index 1ad3dfde..58325001 100644
--- a/editorconfig-conf-mode.el
+++ b/editorconfig-conf-mode.el
@@ -46,6 +46,7 @@
          '("charset"
            "end_of_line"
            "file_type_emacs"
+           "file_type_ext"
            "indent_size"
            "indent_style"
            "insert_final_newline"