diff --git a/source/blender/bmesh/intern/bmesh_polygon.c b/source/blender/bmesh/intern/bmesh_polygon.c
index 6acd790..0a3865c 100644
--- a/source/blender/bmesh/intern/bmesh_polygon.c
+++ b/source/blender/bmesh/intern/bmesh_polygon.c
@@ -741,7 +741,16 @@ float BM_face_calc_normal(const BMFace *f, float r_no[3])
 			const float *co3 = (l = l->next)->v->co;
 			const float *co4 = (l->next)->v->co;
 
+#if 0
 			return normal_quad_v3(r_no, co1, co2, co3, co4);
+#else
+			float n1[3], n2[3];
+
+			normal_tri_v3(n1, co1, co2, co3);
+			normal_tri_v3(n2, co1, co3, co4);
+			add_v3_v3v3(r_no, n1, n2);
+			return normalize_v3(r_no);
+#endif
 		}
 		case 3:
 		{