diff --git a/plugins/VersionUpgrade/VersionUpgrade21to22/MachineInstance.py b/plugins/VersionUpgrade/VersionUpgrade21to22/MachineInstance.py
index 664f972615..b59d72eed8 100644
--- a/plugins/VersionUpgrade/VersionUpgrade21to22/MachineInstance.py
+++ b/plugins/VersionUpgrade/VersionUpgrade21to22/MachineInstance.py
@@ -97,4 +97,4 @@ class MachineInstance:
 
         output = io.StringIO()
         config.write(output)
-        return self._filename, output.getvalue()
\ No newline at end of file
+        return [self._filename], [output.getvalue()]
\ No newline at end of file
diff --git a/plugins/VersionUpgrade/VersionUpgrade21to22/Preferences.py b/plugins/VersionUpgrade/VersionUpgrade21to22/Preferences.py
index 9f6a36d87a..13c98395f2 100644
--- a/plugins/VersionUpgrade/VersionUpgrade21to22/Preferences.py
+++ b/plugins/VersionUpgrade/VersionUpgrade21to22/Preferences.py
@@ -77,4 +77,4 @@ class Preferences:
         #Output the result as a string.
         output = io.StringIO()
         self._config.write(output)
-        return self._filename, output.getvalue()
\ No newline at end of file
+        return [self._filename], [output.getvalue()]
\ No newline at end of file
diff --git a/plugins/VersionUpgrade/VersionUpgrade21to22/Profile.py b/plugins/VersionUpgrade/VersionUpgrade21to22/Profile.py
index 621f346887..b5f5acba11 100644
--- a/plugins/VersionUpgrade/VersionUpgrade21to22/Profile.py
+++ b/plugins/VersionUpgrade/VersionUpgrade21to22/Profile.py
@@ -130,4 +130,4 @@ class Profile:
 
         output = io.StringIO()
         config.write(output)
-        return self._filename, output.getvalue()
\ No newline at end of file
+        return [self._filename], [output.getvalue()]
\ No newline at end of file