diff --git a/src/p_map.c b/src/p_map.c
index 95ad02588..6540a99b2 100644
--- a/src/p_map.c
+++ b/src/p_map.c
@@ -3345,6 +3345,7 @@ static boolean PIT_ChangeSector(mobj_t *thing, boolean realcrush)
 boolean P_CheckSector(sector_t *sector, boolean crunch)
 {
 	msecnode_t *n;
+	size_t i;
 
 	nofit = false;
 	crushchange = crunch;
@@ -3359,9 +3360,57 @@ boolean P_CheckSector(sector_t *sector, boolean crunch)
 
 
 	// First, let's see if anything will keep it from crushing.
+
+	// Sal: This stupid function chain is required to fix polyobjects not being able to crush.
+	// Monster Iestyn: don't use P_CheckSector actually just look for objects in the blockmap instead
+	validcount++;
+
+	for (i = 0; i < sector->linecount; i++)
+	{
+		if (sector->lines[i]->polyobj)
+		{
+			polyobj_t *po = sector->lines[i]->polyobj;
+			if (po->validcount == validcount)
+				continue; // skip if already checked
+			if (!(po->flags & POF_SOLID))
+				continue;
+			if (po->lines[0]->backsector == sector) // Make sure you're currently checking the control sector
+			{
+				INT32 x, y;
+				po->validcount = validcount;
+
+				for (y = po->blockbox[BOXBOTTOM]; y <= po->blockbox[BOXTOP]; ++y)
+				{
+					for (x = po->blockbox[BOXLEFT]; x <= po->blockbox[BOXRIGHT]; ++x)
+					{
+						mobj_t *mo;
+
+						if (x < 0 || y < 0 || x >= bmapwidth || y >= bmapheight)
+							continue;
+
+						mo = blocklinks[y * bmapwidth + x];
+
+						for (; mo; mo = mo->bnext)
+						{
+							// Monster Iestyn: do we need to check if a mobj has already been checked? ...probably not I suspect
+
+							if (!P_MobjTouchingPolyobj(po, mo))
+								continue;
+
+							if (!PIT_ChangeSector(mo, false))
+							{
+								nofit = true;
+								return nofit;
+							}
+						}
+					}
+				}
+			}
+		}
+	}
+
 	if (sector->numattached)
 	{
-		size_t i;
 		sector_t *sec;
 		for (i = 0; i < sector->numattached; i++)
 		{
@@ -3421,9 +3470,53 @@ boolean P_CheckSector(sector_t *sector, boolean crunch)
 	} while (n); // repeat from scratch until all things left are marked valid
 
 	// Nothing blocked us, so lets crush for real!
+
+	// Sal: This stupid function chain is required to fix polyobjects not being able to crush.
+	// Monster Iestyn: don't use P_CheckSector actually just look for objects in the blockmap instead
+	validcount++;
+
+	for (i = 0; i < sector->linecount; i++)
+	{
+		if (sector->lines[i]->polyobj)
+		{
+			polyobj_t *po = sector->lines[i]->polyobj;
+			if (po->validcount == validcount)
+				continue; // skip if already checked
+			if (!(po->flags & POF_SOLID))
+				continue;
+			if (po->lines[0]->backsector == sector) // Make sure you're currently checking the control sector
+			{
+				INT32 x, y;
+				po->validcount = validcount;
+
+				for (y = po->blockbox[BOXBOTTOM]; y <= po->blockbox[BOXTOP]; ++y)
+				{
+					for (x = po->blockbox[BOXLEFT]; x <= po->blockbox[BOXRIGHT]; ++x)
+					{
+						mobj_t *mo;
+
+						if (x < 0 || y < 0 || x >= bmapwidth || y >= bmapheight)
+							continue;
+
+						mo = blocklinks[y * bmapwidth + x];
+
+						for (; mo; mo = mo->bnext)
+						{
+							// Monster Iestyn: do we need to check if a mobj has already been checked? ...probably not I suspect
+
+							if (!P_MobjTouchingPolyobj(po, mo))
+								continue;
+
+							PIT_ChangeSector(mo, true);
+							return nofit;
+						}
+					}
+				}
+			}
+		}
+	}
 	if (sector->numattached)
 	{
-		size_t i;
 		sector_t *sec;
 		for (i = 0; i < sector->numattached; i++)
 		{
diff --git a/src/p_polyobj.c b/src/p_polyobj.c
index 82c57c85b..21d8af5f2 100644
--- a/src/p_polyobj.c
+++ b/src/p_polyobj.c
@@ -1860,7 +1860,7 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 		po->lines[0]->backsector->floorheight = target->z - amtz;
 		po->lines[0]->backsector->ceilingheight = target->z + amtz;
 		// Sal: Remember to check your sectors!
-		P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+		//P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
 		P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 		// Apply action to mirroring polyobjects as well
 		start = 0;
@@ -1874,7 +1874,7 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 			po->lines[0]->backsector->floorheight += diffz; // move up/down by same amount as the parent did
 			po->lines[0]->backsector->ceilingheight += diffz;
 			// Sal: Remember to check your sectors!
-			P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+			//P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
 			P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 		}
 
@@ -2037,7 +2037,7 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 	po->lines[0]->backsector->floorheight += momz;
 	po->lines[0]->backsector->ceilingheight += momz;
 	// Sal: Remember to check your sectors!
-	P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage)); // frontsector is NEEDED for crushing
+	//P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage)); // frontsector is NEEDED for crushing
 	P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage)); // backsector may not be necessary, but just in case
 
 	// Apply action to mirroring polyobjects as well
@@ -2052,7 +2052,7 @@ void T_PolyObjWaypoint(polywaypoint_t *th)
 		po->lines[0]->backsector->floorheight += momz;
 		po->lines[0]->backsector->ceilingheight += momz;
 		// Sal: Remember to check your sectors!
-		P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
+		//P_CheckSector(po->lines[0]->frontsector, (boolean)(po->damage));
 		P_CheckSector(po->lines[0]->backsector, (boolean)(po->damage));
 	}
 }