diff --git a/mongodb_migrations/cli.py b/mongodb_migrations/cli.py
index 4859769..cb4e78c 100644
--- a/mongodb_migrations/cli.py
+++ b/mongodb_migrations/cli.py
@@ -29,7 +29,7 @@ def run(self):
                                            self.config.mongo_url)
         files = os.listdir(self.config.mongo_migrations_path)
         for file in files:
-            result = re.match('^(\d+)[_a-z]*\.py$', file)
+            result = re.match('^(\d+)[._a-z\d]*\.py$', file)
             if result:
                 self.migrations[result.group(1)] = file[:-3]