diff --git a/bob/bio/face/database/mobio.py b/bob/bio/face/database/mobio.py
index 0f4589d57900e02d1d1264a844f8641ef8f7b920..f09b4fe49ff8da219cf449513944793de97a2d29 100644
--- a/bob/bio/face/database/mobio.py
+++ b/bob/bio/face/database/mobio.py
@@ -86,3 +86,7 @@ class MobioBioDatabase(ZTBioDatabase):
 
     def annotations(self, myfile):
         return self._db.annotations(myfile._f)
+
+    def groups(self, protocol=None, **kwargs):
+        return self._db.groups(protocol=protocol)
+