diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index 25b244ffd..ad729b018 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -969,6 +969,7 @@ void FLevelLocals::Serialize(FSerializer &arc, bool hubload)
 
 	arc("flags", flags)
 		("flags2", flags2)
+		("flags3", flags3)
 		("fadeto", fadeto)
 		("found_secrets", found_secrets)
 		("found_items", found_items)