diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index 326f14d205..f422bbc368 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -318,6 +318,7 @@ ACTOR Actor native //: Thinker
 	action native A_TakeFromChildren(class<Inventory> itemtype, int amount = 0);
 	action native A_TakeFromSiblings(class<Inventory> itemtype, int amount = 0);
 	action native A_SetTeleFog(name oldpos, name newpos);
+	action native A_SwapTeleFog();
 
 	action native A_CheckSightOrRange(float distance, state label);
 	action native A_CheckRange(float distance, state label);