diff --git a/src/p_saveg.cpp b/src/p_saveg.cpp
index e58124759..970cc9aa5 100644
--- a/src/p_saveg.cpp
+++ b/src/p_saveg.cpp
@@ -986,6 +986,8 @@ void FLevelLocals::Serialize(FSerializer &arc, bool hubload)
 		("flags2", flags2)
 		("flags3", flags3)
 		("fadeto", fadeto)
+		("skyspeed1", skyspeed1)
+		("skyspeed2", skyspeed2)
 		("found_secrets", found_secrets)
 		("found_items", found_items)
 		("killed_monsters", killed_monsters)