diff --git a/source/addonHandler/__init__.py b/source/addonHandler/__init__.py
index 7f2f6f6dd64..75da59af505 100644
--- a/source/addonHandler/__init__.py
+++ b/source/addonHandler/__init__.py
@@ -72,7 +72,7 @@ def saveState():
 	try:
 		# #9038: Python 3 requires binary format when working with pickles.
 		with open(statePath, "wb") as f:
-			pickle.dump(state, f)
+			pickle.dump(state, f, protocol=0)
 	except:
 		log.debugWarning("Error saving state", exc_info=True)
 
diff --git a/source/updateCheck.py b/source/updateCheck.py
index ec4b033f309..8cf45e20afa 100644
--- a/source/updateCheck.py
+++ b/source/updateCheck.py
@@ -744,7 +744,7 @@ def saveState():
 	try:
 		# #9038: Python 3 requires binary format when working with pickles.
 		with open(_stateFilename, "wb") as f:
-			pickle.dump(state, f)
+			pickle.dump(state, f, protocol=0)
 	except:
 		log.debugWarning("Error saving state", exc_info=True)