diff --git a/src/playsim/p_mobj.cpp b/src/playsim/p_mobj.cpp
index 6945bc9a5..de0ff1b6b 100644
--- a/src/playsim/p_mobj.cpp
+++ b/src/playsim/p_mobj.cpp
@@ -4943,9 +4943,12 @@ void StaticPointerSubstitution(AActor* old, AActor* notOld)
 
 	if (old == nullptr) return;
 
-	// This is only allowed to replace players. For everything else the results are undefined.
-	if (!old->IsKindOf(NAME_PlayerPawn) || (notOld != nullptr && !notOld->IsKindOf(NAME_PlayerPawn))) return;
-
+	// This is only allowed to replace players or swap out morphed monsters
+	if (!old->IsKindOf(NAME_PlayerPawn) || (notOld != nullptr && !notOld->IsKindOf(NAME_PlayerPawn)))
+	{
+		if (notOld == nullptr) return;
+		if (!old->IsKindOf(NAME_MorphedMonster) && !notOld->IsKindOf(NAME_MorphedMonster)) return;
+	}
 	// Go through all objects.
 	i = 0; DObject* last = 0;
 	for (probe = GC::Root; probe != NULL; probe = probe->ObjNext)