diff --git a/src/p_inter.c b/src/p_inter.c
index d11fddcda..cce9df91b 100644
--- a/src/p_inter.c
+++ b/src/p_inter.c
@@ -428,7 +428,7 @@ void P_TouchSpecialThing(mobj_t *special, mobj_t *toucher, boolean heightcheck)
 					  || special->state == &states[S_FANG_BOUNCE4]
 					  || special->state == &states[S_FANG_PINCHBOUNCE3]
 					  || special->state == &states[S_FANG_PINCHBOUNCE4])
-					&& P_MobjFlip(special)*((special->z + special->height/2) - (toucher->z - toucher->height/2)) > -(special->height/4))
+					&& P_MobjFlip(special)*((special->z + special->height/2) - (toucher->z - toucher->height/2)) > (special->height/4))
 					{
 						P_DamageMobj(toucher, special, special, 1, 0);
 						P_SetTarget(&special->tracer, toucher);