diff --git a/app/services/ams/missing_instantiations_locator.rb b/app/services/ams/missing_instantiations_locator.rb
index a19c39db..d89e9d93 100644
--- a/app/services/ams/missing_instantiations_locator.rb
+++ b/app/services/ams/missing_instantiations_locator.rb
@@ -132,7 +132,6 @@ def create_subset_importers
         rights_statement
         override_rights_statement
         file_style
-        import_file_path
       ]
 
       subset_paths.each do |path|
@@ -141,7 +140,7 @@ def create_subset_importers
 
         imp.name = File.basename(path)
         imp.parser_fields = base_imp.parser_fields.slice(*desired_parser_field_attrs)
-        imp.parser_fields['import_file_path'] = path.to_s
+        imp.parser_fields['import_file_path'] = path
 
         imp.save!
       end