diff --git a/extensions/cpp/package.json b/extensions/cpp/package.json
index c1d3f4882f6..9f3c890a48b 100644
--- a/extensions/cpp/package.json
+++ b/extensions/cpp/package.json
@@ -30,9 +30,13 @@
         "id": "cpp",
         "extensions": [
           ".cpp",
+          ".cppm",
           ".cc",
+          ".ccm",
           ".cxx",
+          ".cxxm",
           ".c++",
+          ".c++m",
           ".hpp",
           ".hh",
           ".hxx",