diff --git a/tests/Settings/TestGlobalStack.py b/tests/Settings/TestGlobalStack.py
index a3bf1e5c04..af7b2ec7c5 100644
--- a/tests/Settings/TestGlobalStack.py
+++ b/tests/Settings/TestGlobalStack.py
@@ -60,12 +60,16 @@ def test_deserializeUserChanges(filename, user_changes_id, container_registry, g
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.userChanges.getId() == user_changes_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the quality changes are being read properly from a global
 #   stack.
 @pytest.mark.parametrize("filename,                       quality_changes_id", [
@@ -80,12 +84,16 @@ def test_deserializeQualityChanges(filename, quality_changes_id, container_regis
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.qualityChanges.getId() == quality_changes_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the quality profile is being read properly from a global
 #   stack.
 @pytest.mark.parametrize("filename,                 quality_id", [
@@ -100,12 +108,16 @@ def test_deserializeQuality(filename, quality_id, container_registry, global_sta
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.quality.getId() == quality_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the material profile is being read properly from a global
 #   stack.
 @pytest.mark.parametrize("filename,                   material_id", [
@@ -121,12 +133,16 @@ def test_deserializeMaterial(filename, material_id, container_registry, global_s
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.material.getId() == material_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the variant profile is being read properly from a global
 #   stack.
 @pytest.mark.parametrize("filename,                 variant_id", [
@@ -141,12 +157,16 @@ def test_deserializeVariant(filename, variant_id, container_registry, global_sta
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.variant.getId() == variant_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the definition changes profile is being read properly from a
 #   global stack.
 @pytest.mark.parametrize("filename,                          definition_changes_id", [
@@ -162,12 +182,16 @@ def test_deserializeDefinitionChanges(filename, definition_changes_id, container
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.definitionChanges.getId() == definition_changes_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the definition is being read properly from a global stack.
 @pytest.mark.parametrize("filename,                   definition_id", [
                         ("Global.global.cfg",         "some_definition"),
@@ -181,12 +205,16 @@ def test_deserializeDefinition(filename, definition_id, container_registry, glob
 
     #Mock the loading of the instance containers.
     global_stack.findContainer = findSomeContainers
+    original_container_registry = UM.Settings.ContainerStack._containerRegistry
     UM.Settings.ContainerStack._containerRegistry = container_registry #Always has all the profiles you ask of.
 
     global_stack.deserialize(serialized)
 
     assert global_stack.definition.getId() == definition_id
 
+    #Restore.
+    UM.Settings.ContainerStack._containerRegistry = original_container_registry
+
 ##  Tests whether the hasUserValue returns true for settings that are changed in
 #   the user-changes container.
 def test_hasUserValueUserChanges(global_stack):