diff --git a/cura/Settings/CuraContainerStack.py b/cura/Settings/CuraContainerStack.py
index babf760b35..c010bc7c1e 100755
--- a/cura/Settings/CuraContainerStack.py
+++ b/cura/Settings/CuraContainerStack.py
@@ -351,7 +351,7 @@ class CuraContainerStack(ContainerStack):
 
             if type_name == "definition":
                 if not container or not isinstance(container, DefinitionContainer):
-                    definition = self.findContainer(container_type = DefinitionContainer, category = "*")
+                    definition = self.findContainer(container_type = DefinitionContainer)
                     if not definition:
                         raise InvalidContainerStackError("Stack {id} does not have a definition!".format(id = self._id))
 
diff --git a/tests/Settings/TestCuraContainerRegistry.py b/tests/Settings/TestCuraContainerRegistry.py
index d225fe0371..9cdad7c306 100644
--- a/tests/Settings/TestCuraContainerRegistry.py
+++ b/tests/Settings/TestCuraContainerRegistry.py
@@ -13,6 +13,7 @@ from cura.Settings.GlobalStack import GlobalStack #Testing for returning the cor
 from UM.Resources import Resources #Mocking some functions of this.
 import UM.Settings.ContainerRegistry #Making empty container stacks.
 import UM.Settings.ContainerStack #Setting the container registry here properly.
+from UM.Settings.DefinitionContainer import DefinitionContainer
 
 ##  Gives a fresh CuraContainerRegistry instance.
 @pytest.fixture()
@@ -37,11 +38,15 @@ def test_loadTypes(filename, output_class, container_registry):
     #Mock some dependencies.
     UM.Settings.ContainerStack.setContainerRegistry(container_registry)
     Resources.getAllResourcesOfType = unittest.mock.MagicMock(return_value = [os.path.join(os.path.dirname(os.path.abspath(__file__)), "stacks", filename)]) #Return just this tested file.
-    def findContainers(id, container_type = 0):
-        if id == "some_instance" or id == "some_definition":
+
+    def findContainers(container_type = 0, id = None):
+        if id == "some_instance":
             return [UM.Settings.ContainerRegistry._EmptyInstanceContainer(id)]
+        elif id == "some_definition":
+            return [DefinitionContainer(container_id = id)]
         else:
             return []
+
     container_registry.findContainers = findContainers
 
     with unittest.mock.patch("cura.Settings.GlobalStack.GlobalStack.findContainer"):