diff --git a/src/p_map.cpp b/src/p_map.cpp
index d1fc77268..88366baac 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -2535,11 +2535,7 @@ bool P_CheckMove(AActor *thing, const DVector2 &pos, int flags)
 			}
 			else if ((flags & PCM_DROPOFF) && !(thing->flags & (MF_FLOAT|MF_DROPOFF)))
 			{
-				const DVector3 oldpos = thing->Pos();
-				thing->SetOrigin(pos.X, pos.Y, newz, true);
-				bool hcheck = (newz - thing->dropoffz > thing->MaxDropOffHeight);
-				thing->SetOrigin(oldpos, true);
-				if (hcheck)
+				if (newz - tm.dropoffz > thing->MaxDropOffHeight)
 				{
 					return false;
 				}