diff --git a/src/DatabaseServices/Entity/Polyline.ts b/src/DatabaseServices/Entity/Polyline.ts
index cd0414a93..64a4dcd87 100644
--- a/src/DatabaseServices/Entity/Polyline.ts
+++ b/src/DatabaseServices/Entity/Polyline.ts
@@ -859,7 +859,14 @@ export class Polyline extends Curve
             }
             else if (cu instanceof Arc)
             {
-                this._LineData.push({ pt: cuSp2, bul: cu.Bul });
+                let x = new Vector3().setFromMatrixColumn(cu.OCSNoClone, 0);
+                let y = new Vector3().setFromMatrixColumn(cu.OCSNoClone, 1);
+                let cuZ = x.cross(y);
+
+                let dir = equalv3(this.Normal, cuZ, 1e-4) ? 1 : -1;
+                let bul = cu.Bul * dir;
+
+                this._LineData.push({ pt: cuSp2, bul: bul });
                 this._LineData.push({ pt: cuEp2, bul: 0 });
             }
             else if (cu instanceof Polyline)
@@ -935,7 +942,11 @@ export class Polyline extends Curve
             }
             else if (cu instanceof Arc)
             {
-                let dir = equalv3(this.Normal, cu.Normal.negate()) ? -1 : 1;
+                let x = new Vector3().setFromMatrixColumn(cu.OCSNoClone, 0);
+                let y = new Vector3().setFromMatrixColumn(cu.OCSNoClone, 1);
+                let cuZ = x.cross(y);
+
+                let dir = equalv3(this.Normal, cuZ, 1e-4) ? 1 : -1;
                 let bul = cu.Bul * dir;
                 if (linkType === LinkType.SpSp)
                 {