diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 9a6ef3642..12130c2b1 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -436,6 +436,7 @@ void AActor::Serialize(FSerializer &arc)
 		A("stamina", stamina)
 		("goal", goal)
 		A("waterlevel", waterlevel)
+		A("boomwaterlevel", boomwaterlevel)
 		A("minmissilechance", MinMissileChance)
 		A("spawnflags", SpawnFlags)
 		("inventory", Inventory)