diff --git a/src/p_maputl.h b/src/p_maputl.h
index e5a8a5f4f..0e87e501a 100644
--- a/src/p_maputl.h
+++ b/src/p_maputl.h
@@ -38,17 +38,22 @@ struct intercept_t
 
 inline int P_PointOnLineSidePrecise(double x, double y, const line_t *line)
 {
-	return (y - line->v1->fY()) * line->Delta().X + (line->v1->fX() - x) * line->Delta().Y > -EQUAL_EPSILON;
+	return (y - line->v1->fY()) * line->Delta().X + (line->v1->fX() - x) * line->Delta().Y > EQUAL_EPSILON;
 }
 
 inline int P_PointOnLineSidePrecise(const DVector2 &pt, const line_t *line)
 {
-	return (pt.Y - line->v1->fY()) * line->Delta().X + (line->v1->fX() - pt.X) * line->Delta().Y > -EQUAL_EPSILON;
+	return (pt.Y - line->v1->fY()) * line->Delta().X + (line->v1->fX() - pt.X) * line->Delta().Y > EQUAL_EPSILON;
 }
 
+extern line_t *lines;
 inline int P_PointOnLineSide (double x, double y, const line_t *line)
 {
 	extern int P_VanillaPointOnLineSide(double x, double y, const line_t* line);
+	if (line - lines == 6180)
+	{
+		int a = 0;
+	}
 
 	return i_compatflags2 & COMPATF2_POINTONLINE
 		? P_VanillaPointOnLineSide(x, y, line) : P_PointOnLineSidePrecise(x, y, line);
@@ -73,12 +78,12 @@ inline int P_PointOnLineSide(const DVector2 & p, const line_t *line)
 
 inline int P_PointOnDivlineSide(double x, double y, const divline_t *line)
 {
-	return (y - line->y) * line->dx + (line->x - x) * line->dy > -EQUAL_EPSILON;
+	return (y - line->y) * line->dx + (line->x - x) * line->dy > EQUAL_EPSILON;
 }
 
 inline int P_PointOnDivlineSide(const DVector2 &pos, const divline_t *line)
 {
-	return (pos.Y - line->y) * line->dx + (line->x - pos.X) * line->dy > -EQUAL_EPSILON;
+	return (pos.Y - line->y) * line->dx + (line->x - pos.X) * line->dy > EQUAL_EPSILON;
 }
 
 //==========================================================================