diff --git a/src/p_map.cpp b/src/p_map.cpp
index d5745523c..fca43c120 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -1064,8 +1064,8 @@ bool PIT_CheckThing(AActor *thing, FCheckPosition &tm)
 		{
 			unblocking = true;
 		}
-		else if (abs(thing->x - tm.thing->x) < (thing->radius+tm.thing->radius)/2 &&
-				 abs(thing->y - tm.thing->y) < (thing->radius+tm.thing->radius)/2)
+		else if (abs(thing->x - tm.thing->x) < (thing->radius+tm.thing->radius) &&
+				 abs(thing->y - tm.thing->y) < (thing->radius+tm.thing->radius))
 
 		{
 			fixed_t newdist = P_AproxDistance(thing->x - tm.x, thing->y - tm.y);