diff --git a/app/models/alchemy/element/definitions.rb b/app/models/alchemy/element/definitions.rb
index 3455b8d599..df57d23e33 100644
--- a/app/models/alchemy/element/definitions.rb
+++ b/app/models/alchemy/element/definitions.rb
@@ -8,19 +8,33 @@ module Definitions
       extend ActiveSupport::Concern
 
       module ClassMethods
+        # Register a custom element definitions repository
+        #
+        # The default repository is Alchemy::ElementDefinition
+        #
+        def definitions_repository=(klass)
+          @_definitions_repository = klass
+        end
+
         # Returns the definitions from elements.yml file.
         #
         # Place a +elements.yml+ file inside your apps +config/alchemy+ folder to define
         # your own set of elements
         #
         def definitions
-          ElementDefinition.all
+          definitions_repository.all
         end
 
         # Returns one element definition by given name.
         #
         def definition_by_name(name)
-          ElementDefinition.get(name)
+          definitions_repository.get(name)
+        end
+
+        private
+
+        def definitions_repository
+          @_definitions_repository ||= ElementDefinition
         end
       end
 
diff --git a/spec/models/alchemy/element_spec.rb b/spec/models/alchemy/element_spec.rb
index 037da37cbe..c0c690177d 100644
--- a/spec/models/alchemy/element_spec.rb
+++ b/spec/models/alchemy/element_spec.rb
@@ -310,6 +310,16 @@ module Alchemy
       end
     end
 
+    describe ".definitions_repository=" do
+      let(:dummy_repo) { Class.new }
+
+      it "should be able to set another repository class" do
+        expect(Element.definitions_repository = dummy_repo).to eq(dummy_repo)
+      end
+
+      after { Element.instance_variable_set(:@_definitions_repository, nil) }
+    end
+
     describe ".display_name_for" do
       it "should return the translation for the given name" do
         expect(Alchemy).to receive(:t).with("subheadline", scope: "element_names", default: "Subheadline").and_return("Überschrift")