diff -r b730baee0877 Lib/mimetypes.py
--- a/Lib/mimetypes.py	Tue May 24 16:39:23 2016 -0700
+++ b/Lib/mimetypes.py	Wed May 25 12:40:12 2016 +0200
@@ -33,8 +33,10 @@
     _winreg = None
 
 __all__ = [
-    "guess_type","guess_extension","guess_all_extensions",
-    "add_type","read_mime_types","init"
+    "knownfiles", "inited", "MimeTypes",
+    "guess_type", "guess_all_extensions", "guess_extension",
+    "add_type", "init", "read_mime_types",
+    "suffix_map", "encodings_map", "types_map", "common_types"
 ]
 
 knownfiles = [
diff -r b730baee0877 Lib/test/test_mimetypes.py
--- a/Lib/test/test_mimetypes.py	Tue May 24 16:39:23 2016 -0700
+++ b/Lib/test/test_mimetypes.py	Wed May 25 12:40:12 2016 +0200
@@ -101,5 +101,11 @@
         eq(self.db.guess_type("image.jpg"), ("image/jpeg", None))
         eq(self.db.guess_type("image.png"), ("image/png", None))
 
+
+class MiscTestCase(unittest.TestCase):
+    def test__all__(self):
+        support.check__all__(self, mimetypes)
+
+
 if __name__ == "__main__":
     unittest.main()