diff --git a/lib/galaxy/tools/evaluation.py b/lib/galaxy/tools/evaluation.py
index 8ba4fe676a9c..7c230b9693be 100644
--- a/lib/galaxy/tools/evaluation.py
+++ b/lib/galaxy/tools/evaluation.py
@@ -318,6 +318,7 @@ def __populate_output_collection_wrappers(self, param_dict, output_collections,
             wrapper_kwds = dict(
                 datatypes_registry=self.app.datatypes_registry,
                 compute_environment=self.compute_environment,
+                io_type='output',
                 tool=tool,
                 name=name
             )