diff --git a/plugins/VersionUpgrade/VersionUpgrade41to42/VersionUpgrade41to42.py b/plugins/VersionUpgrade/VersionUpgrade41to42/VersionUpgrade41to42.py
index c7ff8dcce0..4b4892d817 100644
--- a/plugins/VersionUpgrade/VersionUpgrade41to42/VersionUpgrade41to42.py
+++ b/plugins/VersionUpgrade/VersionUpgrade41to42/VersionUpgrade41to42.py
@@ -320,7 +320,7 @@ class VersionUpgrade41to42(VersionUpgrade):
             if material_id in _creality_quality_per_material and old_quality_id in _creality_quality_per_material[material_id]:
                 parser["containers"]["2"] = _creality_quality_per_material[material_id][old_quality_id]
 
-            stack_copy = {} #Make a copy so that we don't modify the dict we're iterating over.
+            stack_copy = {}  # type: Dict[str, str] #Make a copy so that we don't modify the dict we're iterating over.
             stack_copy.update(parser["containers"])
             for position, profile_id in stack_copy.items():
                 if profile_id in _renamed_profiles:
@@ -328,4 +328,4 @@ class VersionUpgrade41to42(VersionUpgrade):
 
         result = io.StringIO()
         parser.write(result)
-        return [filename], [result.getvalue()]
\ No newline at end of file
+        return [filename], [result.getvalue()]