diff --git a/packages/tui/src/util/filetype.ts b/packages/tui/src/util/filetype.ts
index e52b0effedd..16a89bc0894 100644
--- a/packages/tui/src/util/filetype.ts
+++ b/packages/tui/src/util/filetype.ts
@@ -15,6 +15,11 @@ export const LANGUAGE_EXTENSIONS: Record<string, string> = {
   ".cxx": "cpp",
   ".cc": "cpp",
   ".c++": "cpp",
+  ".cppm": "cpp",
+  ".ccm": "cpp",
+  ".cxxm": "cpp",
+  ".c++m": "cpp",
+  ".ixx": "cpp",
   ".cs": "csharp",
   ".csx": "csharp",
   ".css": "css",