diff --git a/src/p_local.h b/src/p_local.h
index 3aff45bf0..e42dc960d 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -94,7 +94,7 @@ APlayerPawn *P_SpawnPlayer (FMapThing *mthing, bool tempplayer=false);
 
 void P_ThrustMobj (AActor *mo, angle_t angle, fixed_t move);
 int P_FaceMobj (AActor *source, AActor *target, angle_t *delta);
-bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax);
+bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax, bool precise = false);
 
 enum EPuffFlags
 {
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 613054652..dbb3f38b7 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -1543,11 +1543,12 @@ bool AActor::CanSeek(AActor *target) const
 //
 //----------------------------------------------------------------------------
 
-bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax)
+bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax, bool precise)
 {
 	int dir;
+	int dist;
 	angle_t delta;
-	angle_t angle, pitch;
+	angle_t angle;
 	AActor *target;
 
 	target = actor->tracer;
@@ -1577,30 +1578,55 @@ bool P_SeekerMissile (AActor *actor, angle_t thresh, angle_t turnMax)
 	{ // Turn counter clockwise
 		actor->angle -= delta;
 	}
-	angle = actor->angle >> ANGLETOFINESHIFT;
-	pitch = 0;
+	angle = actor->angle>>ANGLETOFINESHIFT;
+	
+	if (!precise)
+	{
+		actor->velx = FixedMul (actor->Speed, finecosine[angle]);
+		actor->vely = FixedMul (actor->Speed, finesine[angle]);
 
-	if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
-	{ // Need to seek vertically
-		double dist = MAX(1.0, FVector2(target->x - actor->x, target->y - actor->y).Length());
-		// Aim at a player's eyes and at the middle of the actor for everything else.
-		fixed_t aimheight = target->height/2;
-		if (target->IsKindOf(RUNTIME_CLASS(APlayerPawn)))
+		if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
 		{
-			aimheight = static_cast<APlayerPawn *>(target)->ViewHeight;
+			if (actor->z + actor->height < target->z ||
+				target->z + target->height < actor->z)
+			{ // Need to seek vertically
+				dist = P_AproxDistance (target->x - actor->x, target->y - actor->y);
+				dist = dist / actor->Speed;
+				if (dist < 1)
+				{
+					dist = 1;
+				}
+				actor->velz = ((target->z+target->height/2) - (actor->z+actor->height/2)) / dist;
+			}
 		}
-		pitch = R_PointToAngle2(0, actor->z + actor->height/2, xs_CRoundToInt(dist), target->z + aimheight);
-		pitch >>= ANGLETOFINESHIFT;
+	}
+	else
+	{
+		angle_t pitch;
+		if (!(actor->flags3 & (MF3_FLOORHUGGER|MF3_CEILINGHUGGER)))
+		{ // Need to seek vertically
+			double dist = MAX(1.0, FVector2(target->x - actor->x, target->y - actor->y).Length());
+			// Aim at a player's eyes and at the middle of the actor for everything else.
+			fixed_t aimheight = target->height/2;
+			if (target->IsKindOf(RUNTIME_CLASS(APlayerPawn)))
+			{
+				aimheight = static_cast<APlayerPawn *>(target)->ViewHeight;
+			}
+			pitch = R_PointToAngle2(0, actor->z + actor->height/2, xs_CRoundToInt(dist), target->z + aimheight);
+			pitch >>= ANGLETOFINESHIFT;
+		}
+
+		fixed_t xyscale = FixedMul(actor->Speed, finecosine[pitch]);
+		actor->velz = FixedMul(actor->Speed, finesine[pitch]);
+		actor->velx = FixedMul(xyscale, finecosine[angle]);
+		actor->vely = FixedMul(xyscale, finesine[angle]);
 	}
 
-	fixed_t xyscale = FixedMul(actor->Speed, finecosine[pitch]);
-	actor->velz = FixedMul(actor->Speed, finesine[pitch]);
-	actor->velx = FixedMul(xyscale, finecosine[angle]);
-	actor->vely = FixedMul(xyscale, finesine[angle]);
 
 	return true;
 }
 
+
 //
 // P_XYMovement
 //
diff --git a/src/thingdef/thingdef_codeptr.cpp b/src/thingdef/thingdef_codeptr.cpp
index 45038d83f..6d066684b 100644
--- a/src/thingdef/thingdef_codeptr.cpp
+++ b/src/thingdef/thingdef_codeptr.cpp
@@ -346,6 +346,7 @@ static FRandom pr_seekermissile ("SeekerMissile");
 enum
 {
 	SMF_LOOK = 1,
+	SMF_PRECISE = 2,
 };
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SeekerMissile)
 {
@@ -360,7 +361,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_SeekerMissile)
 	{
 		self->tracer = P_RoughMonsterSearch (self, distance);
 	}
-	P_SeekerMissile(self, clamp<int>(ang1, 0, 90) * ANGLE_1, clamp<int>(ang2, 0, 90) * ANGLE_1);
+	P_SeekerMissile(self, clamp<int>(ang1, 0, 90) * ANGLE_1, clamp<int>(ang2, 0, 90) * ANGLE_1, !!(flags & SMF_PRECISE));
 }
 
 //==========================================================================
diff --git a/wadsrc/static/actors/constants.txt b/wadsrc/static/actors/constants.txt
index 0e1f8f903..0fd613a72 100644
--- a/wadsrc/static/actors/constants.txt
+++ b/wadsrc/static/actors/constants.txt
@@ -79,6 +79,7 @@ const int BF_AFFECTBOSSES = 4;
 
 // Flags for A_SeekerMissile
 const int SMF_LOOK = 1;
+const int SMF_PRECISE = 2;
 
 // Activation flags
 enum