diff --git a/src/actor.h b/src/actor.h
index a7f06281a..5a8acbfc8 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -764,7 +764,6 @@ public:
 	DWORD			flags6;			// Shit! Where did all the flags go?
 	int				special1;		// Special info
 	int				special2;		// Special info
-	int				weaveindex;		// Separated from special2 because it's used by globally accessible functions.
 	int 			health;
 	BYTE			movedir;		// 0-7
 	SBYTE			visdir;
@@ -782,6 +781,8 @@ public:
 	TObjPtr<AActor>	LastLookActor;	// Actor last looked for (if TIDtoHate != 0)
 	fixed_t			SpawnPoint[3]; 	// For nightmare respawn
 	WORD			SpawnAngle;
+	BYTE			WeaveIndexXY;	// Separated from special2 because it's used by globally accessible functions.
+	BYTE			WeaveIndexZ;
 	int				skillrespawncount;
 	int				TIDtoHate;			// TID of things to hate (0 if none)
 	FNameNoInit		Species;		// For monster families
diff --git a/src/g_hexen/a_bishop.cpp b/src/g_hexen/a_bishop.cpp
index df998a8ab..d4de94f60 100644
--- a/src/g_hexen/a_bishop.cpp
+++ b/src/g_hexen/a_bishop.cpp
@@ -76,12 +76,9 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopMissileWeave)
 	int weaveXY, weaveZ;
 	int angle;
 
-	// for compatibility this needs to set the value itself if it was never done by the projectile itself
-	if (self->weaveindex == -1) self->weaveindex = 16;
-
 	// since these values are now user configurable we have to do a proper range check to avoid array overflows.
-	weaveXY = (self->weaveindex >> 16) & 63;
-	weaveZ = (self->weaveindex & 63);
+	weaveXY = self->WeaveIndexXY & 63;
+	weaveZ = self->WeaveIndexZ & 63;
 	angle = (self->angle + ANG90) >> ANGLETOFINESHIFT;
 	newX = self->x - FixedMul (finecosine[angle], FloatBobOffsets[weaveXY]<<1);
 	newY = self->y - FixedMul (finesine[angle], FloatBobOffsets[weaveXY]<<1);
@@ -92,7 +89,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_BishopMissileWeave)
 	self->z -= FloatBobOffsets[weaveZ];
 	weaveZ = (weaveZ + 2) & 63;
 	self->z += FloatBobOffsets[weaveZ];	
-	self->weaveindex = weaveZ + (weaveXY<<16);
+	self->WeaveIndexXY = weaveXY;
+	self->WeaveIndexZ = weaveZ;
 }
 
 //============================================================================
diff --git a/src/g_hexen/a_clericstaff.cpp b/src/g_hexen/a_clericstaff.cpp
index b2a50487c..a29d3afd6 100644
--- a/src/g_hexen/a_clericstaff.cpp
+++ b/src/g_hexen/a_clericstaff.cpp
@@ -135,12 +135,12 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffAttack)
 	mo = P_SpawnPlayerMissile (self, RUNTIME_CLASS(ACStaffMissile), self->angle-(ANG45/15));
 	if (mo)
 	{
-		mo->weaveindex = 32;
+		mo->WeaveIndexXY = 32;
 	}
 	mo = P_SpawnPlayerMissile (self, RUNTIME_CLASS(ACStaffMissile), self->angle+(ANG45/15));
 	if (mo)
 	{
-		mo->weaveindex = 0;
+		mo->WeaveIndexXY = 0;
 	}
 	S_Sound (self, CHAN_WEAPON, "ClericCStaffFire", 1, ATTN_NORM);
 }
@@ -157,10 +157,8 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffMissileSlither)
 	int weaveXY;
 	int angle;
 
-	if (self->weaveindex == -1) self->weaveindex = 0;
-
 	// since these values are now user configurable we have to do a proper range check to avoid array overflows.
-	weaveXY = self->weaveindex & 63;
+	weaveXY = self->WeaveIndexXY & 63;
 	angle = (self->angle+ANG90)>>ANGLETOFINESHIFT;
 	newX = self->x-FixedMul(finecosine[angle], FloatBobOffsets[weaveXY]);
 	newY = self->y-FixedMul(finesine[angle], FloatBobOffsets[weaveXY]);
@@ -168,7 +166,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_CStaffMissileSlither)
 	newX += FixedMul(finecosine[angle], FloatBobOffsets[weaveXY]);
 	newY += FixedMul(finesine[angle], FloatBobOffsets[weaveXY]);
 	P_TryMove (self, newX, newY, true);
-	self->weaveindex = weaveXY;
+	self->WeaveIndexXY = weaveXY;
 }
 
 //============================================================================
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index c0f8af6e8..496bd7587 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -312,13 +312,34 @@ void AActor::Serialize (FArchive &arc)
 	{
 		arc << DamageFactor;
 	}
-	if (SaveVersion >= 2036)
+	if (SaveVersion > 2036)
 	{
-		arc << weaveindex;
+		arc << WeaveIndexXY << WeaveIndexZ;
 	}
 	else
 	{
-		weaveindex = special2;
+		int index;
+
+		if (SaveVersion < 2036)
+		{
+			index = special2;
+		}
+		else
+		{
+			arc << index;
+		}
+		// A_BishopMissileWeave and A_CStaffMissileSlither stored the weaveXY
+		// value in different parts of the index.
+		if (this->IsKindOf(PClass::FindClass("BishopFX")))
+		{
+			WeaveIndexXY = index >> 16;
+			WeaveIndexZ = index;
+		}
+		else
+		{
+			WeaveIndexXY = index;
+			WeaveIndexZ = 0;
+		}
 	}
 
 	// Skip past uservar array in old savegames
diff --git a/src/thingdef/thingdef_properties.cpp b/src/thingdef/thingdef_properties.cpp
index e8b170880..cd2537db0 100644
--- a/src/thingdef/thingdef_properties.cpp
+++ b/src/thingdef/thingdef_properties.cpp
@@ -905,10 +905,19 @@ DEFINE_PROPERTY(bouncecount, I, Actor)
 //==========================================================================
 //
 //==========================================================================
-DEFINE_PROPERTY(weaveindex, I, Actor)
+DEFINE_PROPERTY(weaveindexXY, I, Actor)
 {
 	PROP_INT_PARM(id, 0);
-	defaults->weaveindex = id;
+	defaults->WeaveIndexXY = id;
+}
+
+//==========================================================================
+//
+//==========================================================================
+DEFINE_PROPERTY(weaveindexZ, I, Actor)
+{
+	PROP_INT_PARM(id, 0);
+	defaults->WeaveIndexZ = id;
 }
 
 //==========================================================================
diff --git a/wadsrc/static/actors/actor.txt b/wadsrc/static/actors/actor.txt
index 71c0790db..8517b12fd 100644
--- a/wadsrc/static/actors/actor.txt
+++ b/wadsrc/static/actors/actor.txt
@@ -19,7 +19,8 @@ ACTOR Actor native //: Thinker
 	Gravity 1
 	DamageFactor 1.0
 	PushFactor 0.25
-	WeaveIndex -1
+	WeaveIndexXY 0
+	WeaveIndexZ 16
 
 	// Variables for the expression evaluator
 	// NOTE: fixed_t and angle_t are only used here to ensure proper conversion