diff --git a/src/info.cpp b/src/info.cpp
index c81a96d1e..857598385 100644
--- a/src/info.cpp
+++ b/src/info.cpp
@@ -255,7 +255,7 @@ void FActorInfo::RegisterIDs ()
 	if (gameinfo.gametype == GAME_Chex && DoomEdMap.FindType(DoomEdNum) == NULL &&
 		(GameFilter & GAME_Doom))
 	{
-		DoomEdMap.AddType (DoomEdNum, Class);
+		DoomEdMap.AddType (DoomEdNum, Class, true);
 	}
 }
 
@@ -554,7 +554,7 @@ FDoomEdMap::~FDoomEdMap()
 	Empty();
 }
 
-void FDoomEdMap::AddType (int doomednum, const PClass *type)
+void FDoomEdMap::AddType (int doomednum, const PClass *type, bool temporary)
 {
 	unsigned int hash = (unsigned int)doomednum % DOOMED_HASHSIZE;
 	FDoomEdEntry *entry = DoomEdHash[hash];
@@ -569,11 +569,12 @@ void FDoomEdMap::AddType (int doomednum, const PClass *type)
 		entry->DoomEdNum = doomednum;
 		DoomEdHash[hash] = entry;
 	}
-	else
+	else if (!entry->temp)
 	{
 		Printf (PRINT_BOLD, "Warning: %s and %s both have doomednum %d.\n",
 			type->TypeName.GetChars(), entry->Type->TypeName.GetChars(), doomednum);
 	}
+	entry->temp = temporary;
 	entry->Type = type;
 }
 
diff --git a/src/info.h b/src/info.h
index 250f08fde..47273cf13 100644
--- a/src/info.h
+++ b/src/info.h
@@ -232,7 +232,7 @@ public:
 	~FDoomEdMap();
 
 	const PClass *FindType (int doomednum) const;
-	void AddType (int doomednum, const PClass *type);
+	void AddType (int doomednum, const PClass *type, bool temporary = false);
 	void DelType (int doomednum);
 	void Empty ();
 
@@ -246,6 +246,7 @@ private:
 		FDoomEdEntry *HashNext;
 		const PClass *Type;
 		int DoomEdNum;
+		bool temp;
 	};
 
 	static FDoomEdEntry *DoomEdHash[DOOMED_HASHSIZE];
diff --git a/wadsrc/static/actors/hexen/fog.txt b/wadsrc/static/actors/hexen/fog.txt
index 9711bae36..81f5aeea5 100644
--- a/wadsrc/static/actors/hexen/fog.txt
+++ b/wadsrc/static/actors/hexen/fog.txt
@@ -46,6 +46,7 @@ ACTOR FogPatchSmall 10001
 
 ACTOR FogPatchMedium : FogPatchSmall 10002
 {
+	Game Hexen
 	States
 	{
 	Spawn:
@@ -61,6 +62,7 @@ ACTOR FogPatchMedium : FogPatchSmall 10002
 
 ACTOR FogPatchLarge : FogPatchMedium 10003
 {
+	Game Hexen
 	States
 	{
 	Spawn:
diff --git a/wadsrc/static/actors/hexen/heresiarch.txt b/wadsrc/static/actors/hexen/heresiarch.txt
index 23e9c580d..526642506 100644
--- a/wadsrc/static/actors/hexen/heresiarch.txt
+++ b/wadsrc/static/actors/hexen/heresiarch.txt
@@ -3,6 +3,7 @@
 
 ACTOR Heresiarch 10080 native
 {
+	Game Hexen
 	Health 5000
 	Painchance 10
 	Speed 16