diff --git a/main/collide.c b/main/collide.c
index f9f98dc74..cb20d5d29 100644
--- a/main/collide.c
+++ b/main/collide.c
@@ -373,7 +373,7 @@ int check_effect_blowup(segment *seg,int side,vms_vector *pnt)
 
 				//this can be blown up...did we hit it?
 
-				find_hitpoint_uv(&u,&v,pnt,seg,side,0);	//evil: always say face zero
+				find_hitpoint_uv(&u,&v,NULL,pnt,seg,side,0);	//evil: always say face zero
 
 				x = ((unsigned) f2i(u*bm->bm_w)) % bm->bm_w;
 				y = ((unsigned) f2i(v*bm->bm_h)) % bm->bm_h;
diff --git a/main/fvi.c b/main/fvi.c
index 8e892eaf2..a227f9c88 100644
--- a/main/fvi.c
+++ b/main/fvi.c
@@ -1093,8 +1093,9 @@ quit_looking:
 
 //finds the uv coords of the given point on the given seg & side
 //fills in u & v
-void find_hitpoint_uv(fix *u,fix *v,vms_vector *pnt,segment *seg,int sidenum,int facenum)
+void find_hitpoint_uv(fix *u,fix *v,fix *l,vms_vector *pnt,segment *seg,int sidenum,int facenum)
 {
+    (void)l;
 	vms_vector_array *pnt_array;
 	vms_vector_array normal_array;
 	int segnum = seg-Segments;
@@ -1179,7 +1180,7 @@ int check_trans_wall(vms_vector *pnt,segment *seg,int sidenum,int facenum)
 
 	Assert(WALL_IS_DOORWAY(seg,sidenum) == WID_TRANSPARENT_WALL);
 
-	find_hitpoint_uv(&u,&v,pnt,seg,sidenum,facenum);
+	find_hitpoint_uv(&u,&v,NULL,pnt,seg,sidenum,facenum);
 
 	if (side->tmap_num2 != 0)	{
 		bm = texmerge_get_cached_bitmap( side->tmap_num, side->tmap_num2 );
diff --git a/main/fvi.h b/main/fvi.h
index 15500765f..b6812fd59 100644
--- a/main/fvi.h
+++ b/main/fvi.h
@@ -131,7 +131,7 @@ int find_vector_intersection(fvi_query *fq,fvi_info *hit_data);
 
 //finds the uv coords of the given point on the given seg & side
 //fills in u & v
-void find_hitpoint_uv(fix *u,fix *v,vms_vector *pnt,segment *seg,int sidenum,int facenum);
+void find_hitpoint_uv(fix *u,fix *v,fix *l,vms_vector *pnt,segment *seg,int sidenum,int facenum);
 
 //Returns true if the object is through any walls
 int object_intersects_wall(object *objp);