diff --git a/src/p_local.h b/src/p_local.h
index cb404eb8cf..95d7541a8f 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -242,7 +242,7 @@ inline int P_PointOnLineSide (fixed_t x, fixed_t y, const line_t *line)
 {
 	extern int P_VanillaPointOnLineSide(fixed_t x, fixed_t y, const line_t* line);
 
-	return compatflags2 & COMPATF2_POINTONLINE
+	return i_compatflags2 & COMPATF2_POINTONLINE
 		? P_VanillaPointOnLineSide(x, y, line)
 		: DMulScale32 (y-line->v1->y, line->dx, line->v1->x-x, line->dy) > 0;
 }
@@ -260,7 +260,7 @@ inline int P_PointOnDivlineSide (fixed_t x, fixed_t y, const divline_t *line)
 {
 	extern int P_VanillaPointOnDivlineSide(fixed_t x, fixed_t y, const divline_t* line);
 
-	return (compatflags2 & COMPATF2_POINTONLINE)
+	return (i_compatflags2 & COMPATF2_POINTONLINE)
 		? P_VanillaPointOnDivlineSide(x, y, line)
 		: (DMulScale32 (y-line->y, line->dx, line->x-x, line->dy) > 0);
 }