diff --git a/lib/galaxy/util/none_like.py b/lib/galaxy/util/none_like.py
index 1d5295082bd..67b8f3ea0f1 100644
--- a/lib/galaxy/util/none_like.py
+++ b/lib/galaxy/util/none_like.py
@@ -23,7 +23,7 @@ class NoneDataset( RecursiveNone ):
         if datatypes_registry is None: datatypes_registry = Registry()
         self.datatype = datatypes_registry.get_datatype_by_extension( ext )
         self._metadata = None
-        self.metadata = MetadataCollection( self, self.datatype.metadata_spec )
+        self.metadata = MetadataCollection( self )
     def __getattr__( self, name ):
         return "None"
     def missing_meta( self ):