diff --git a/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py b/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py
index 6af08e7d66..1d278764f0 100644
--- a/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py
+++ b/plugins/VersionUpgrade/VersionUpgrade44to45/VersionUpgrade44to45.py
@@ -10,7 +10,7 @@ from UM.VersionUpgrade import VersionUpgrade
 
 class VersionUpgrade44to45(VersionUpgrade):
     def getCfgVersion(self, serialised: str) -> int:
-        parser = configparser.ConfigParser(interpolation = None, comment_prefixes=())
+        parser = configparser.ConfigParser(interpolation = None)
         parser.read_string(serialised)
         format_version = int(parser.get("general", "version"))  # Explicitly give an exception when this fails. That means that the file format is not recognised.
         setting_version = int(parser.get("metadata", "setting_version", fallback = "0"))
@@ -35,7 +35,7 @@ class VersionUpgrade44to45(VersionUpgrade):
     #
     #   This renames the renamed settings in the containers.
     def upgradeInstanceContainer(self, serialized: str, filename: str) -> Tuple[List[str], List[str]]:
-        parser = configparser.ConfigParser(interpolation = None)
+        parser = configparser.ConfigParser(interpolation = None, comment_prefixes=())
         parser.read_string(serialized)
 
         # Update version number.