diff --git a/lib/galaxy/model/mapping.py b/lib/galaxy/model/mapping.py
index d4f0e0c245e1..95b5ebdf3292 100644
--- a/lib/galaxy/model/mapping.py
+++ b/lib/galaxy/model/mapping.py
@@ -2137,6 +2137,7 @@ def simple_mapping(model, **kwds):
     library_folder=relation(model.LibraryFolder, lazy=True),
     parameters=relation(model.JobParameter, lazy=True),
     input_datasets=relation(model.JobToInputDatasetAssociation),
+    input_dataset_collections=relation(model.JobToInputDatasetCollectionAssociation, lazy=True),
     output_datasets=relation(model.JobToOutputDatasetAssociation, lazy=True),
     output_dataset_collection_instances=relation(model.JobToOutputDatasetCollectionAssociation, lazy=True),
     output_dataset_collections=relation(model.JobToImplicitOutputDatasetCollectionAssociation, lazy=True),