diff --git a/services/web/frontend/js/features/source-editor/languages/index.ts b/services/web/frontend/js/features/source-editor/languages/index.ts
index 9a698b056a..b3e024a597 100644
--- a/services/web/frontend/js/features/source-editor/languages/index.ts
+++ b/services/web/frontend/js/features/source-editor/languages/index.ts
@@ -8,15 +8,11 @@ export const languages = [
       'sty',
       'cls',
       'clo',
-      'bst',
       'bbl',
       'pdf_tex',
       'pdf_t',
-      'map',
       'fd',
-      'enc',
       'def',
-      'mf',
       'pgf',
       'tikz',
       'bbx',
@@ -28,7 +24,6 @@ export const languages = [
       'xmpdata',
       'Rnw',
       'rnw',
-      'lyx',
       'inc',
       'dtx',
       'hak',