diff --git a/sources/dicom/large_image_source_dicom/assetstore/rest.py b/sources/dicom/large_image_source_dicom/assetstore/rest.py
index 6d7dea4a2..bef2ec583 100644
--- a/sources/dicom/large_image_source_dicom/assetstore/rest.py
+++ b/sources/dicom/large_image_source_dicom/assetstore/rest.py
@@ -60,12 +60,11 @@ def _importData(self, assetstore, params):
         .param('destinationId', 'The ID of the parent folder, collection, or user '
                'in the Girder data hierarchy under which to import the files.')
         .param('destinationType', 'The type of the parent object to import into.',
-               enum=('folder', 'user', 'collection'),
-               required=False)
+               enum=('folder', 'user', 'collection'), required=True)
         .param('filters', 'Any search parameters to filter DICOM objects.',
-               required=False)
+               required=False, default={})
         .param('progress', 'Whether to record progress on this operation ('
-               'default=False)', required=False, dataType='boolean')
+               'default=False)', required=False, default=False, dataType='boolean')
         .errorResponse()
         .errorResponse('You are not an administrator.', 403),
     )