diff --git a/lib/blacklight/configuration.rb b/lib/blacklight/configuration.rb
index 88ebe99fc2..8df92da75e 100644
--- a/lib/blacklight/configuration.rb
+++ b/lib/blacklight/configuration.rb
@@ -252,8 +252,16 @@ def deep_copy
       end
       alias_method :inheritable_copy, :deep_copy
     else
-      alias_method :deep_copy, :deep_dup
-      alias_method :inheritable_copy, :deep_dup
+      ##
+      # Rails 4.x provides `#deep_dup`, but it aggressively `#dup`'s class names
+      # too. These model names should not be `#dup`'ed or we might break ActiveModel::Naming.
+      def deep_copy
+        deep_dup.tap do |copy|
+          copy.solr_response_model = self.solr_response_model
+          copy.solr_document_model = self.solr_document_model
+        end
+      end
+      alias_method :inheritable_copy, :deep_copy
     end
 
     ##
diff --git a/lib/blacklight/routes.rb b/lib/blacklight/routes.rb
index 01eceea08c..e3b88fd5de 100644
--- a/lib/blacklight/routes.rb
+++ b/lib/blacklight/routes.rb
@@ -66,7 +66,10 @@ def bookmarks(_)
           get "bookmarks/sms", :as => "sms_bookmarks"
           post "bookmarks/sms"
           get "bookmarks/citation", :as => "citation_bookmarks"
-          resources :bookmarks
+
+          args = {}
+          args[:constraints] = options[:constraints] if options[:constraints]
+          resources :bookmarks, args
         end
       end
   
diff --git a/spec/lib/blacklight/configuration_spec.rb b/spec/lib/blacklight/configuration_spec.rb
index 71970aacf2..1eb4d21572 100644
--- a/spec/lib/blacklight/configuration_spec.rb
+++ b/spec/lib/blacklight/configuration_spec.rb
@@ -84,6 +84,16 @@
       expect(@config.facet_fields).to_not include(@mock_facet)
     end
 
+    it "should not dup solr_response_model or solr_document_model" do
+      @config.solr_response_model = Blacklight::SolrResponse
+      @config.solr_document_model = SolrDocument
+
+      config_copy = @config.inheritable_copy
+
+      expect(config_copy.solr_response_model).to eq Blacklight::SolrResponse
+      expect(config_copy.solr_document_model).to eq SolrDocument
+    end
+
     it "should provide cloned copies of mutable data structures" do
       @config.a = { value: 1 }
       @config.b = [1,2,3]