diff --git a/compdb/filelist.py b/compdb/filelist.py
index 9e3921d..d522452 100644
--- a/compdb/filelist.py
+++ b/compdb/filelist.py
@@ -17,6 +17,8 @@ def __init__(self):
             '.C++',
             '.cxx',
             '.cpp',
+            '.m',
+            '.mm',
         ]
         self.header_exts = [
             '.h',