diff --git a/src/libs/vlayout/vabstractpiece.cpp b/src/libs/vlayout/vabstractpiece.cpp
index 70db3c3a5..c326c3cb5 100644
--- a/src/libs/vlayout/vabstractpiece.cpp
+++ b/src/libs/vlayout/vabstractpiece.cpp
@@ -951,8 +951,7 @@ QVector<QPointF> VAbstractPiece::SubPath(const QVector<QPointF> &path, int start
 //---------------------------------------------------------------------------------------------------------------------
 bool VAbstractPiece::IsEkvPointOnLine(const QPointF &iPoint, const QPointF &prevPoint, const QPointF &nextPoint)
 {
-    return (VGObject::IsPointOnLineviaPDP(iPoint, prevPoint, nextPoint)
-            && prevPoint == nextPoint);// not zigzag
+    return VGObject::IsPointOnLineviaPDP(iPoint, prevPoint, nextPoint);
 }
 
 //---------------------------------------------------------------------------------------------------------------------
@@ -969,7 +968,5 @@ bool VAbstractPiece::IsEkvPointOnLine(const VSAPoint &iPoint, const VSAPoint &pr
             ekvPointOnLine = true;
         }
     }
-    return (VGObject::IsPointOnLineviaPDP(iPoint, prevPoint, nextPoint)
-            && prevPoint == nextPoint// not zigzag
-            && ekvPointOnLine);
+    return (VGObject::IsPointOnLineviaPDP(iPoint, prevPoint, nextPoint) && ekvPointOnLine);
 }
diff --git a/src/libs/vlayout/vabstractpiece.h b/src/libs/vlayout/vabstractpiece.h
index 15c8a058d..9f932fd5c 100644
--- a/src/libs/vlayout/vabstractpiece.h
+++ b/src/libs/vlayout/vabstractpiece.h
@@ -172,6 +172,7 @@ protected:
     template <class T>
     static QVector<T> RemoveDublicates(const QVector<T> &points, bool removeFirstAndLast = true);
     static qreal      MaxLocalSA(const VSAPoint &p, qreal width);
+    static bool       IsEkvPointOnLine(const VSAPoint &iPoint, const VSAPoint &prevPoint, const VSAPoint &nextPoint);
 
 private:
     QSharedDataPointer<VAbstractPieceData> d;
@@ -204,8 +205,6 @@ private:
     static QLineF           BisectorLine(const QPointF &p1, const QPointF &p2, const QPointF &p3);
     static qreal            AngleBetweenBisectors(const QLineF &b1, const QLineF &b2);
     static bool             IsEkvPointOnLine(const QPointF &iPoint, const QPointF &prevPoint, const QPointF &nextPoint);
-    static bool             IsEkvPointOnLine(const VSAPoint &iPoint, const VSAPoint &prevPoint,
-                                             const VSAPoint &nextPoint);
 };
 
 Q_DECLARE_TYPEINFO(VAbstractPiece, Q_MOVABLE_TYPE);
@@ -255,7 +254,7 @@ QVector<T> VAbstractPiece::CorrectEquidistantPoints(const QVector<T> &points, bo
         const T &prevPoint = buf1.at(prev);
         const T &nextPoint = buf1.at(next);
 
-        if (not IsEkvPointOnLine(iPoint, prevPoint, nextPoint)
+        if (not (IsEkvPointOnLine(iPoint, prevPoint, nextPoint) && prevPoint == nextPoint/*not zigzag*/)
                 // If RemoveDublicates does not remove these points it is a valid case.
                 // Case where last point equal first point
                 || ((i == 0 || i == buf1.size() - 1) && (iPoint == prevPoint || iPoint == nextPoint)))
diff --git a/src/libs/vpatterndb/vpiece.cpp b/src/libs/vpatterndb/vpiece.cpp
index cd30a3d8b..7259a9fff 100644
--- a/src/libs/vpatterndb/vpiece.cpp
+++ b/src/libs/vpatterndb/vpiece.cpp
@@ -1006,8 +1006,19 @@ bool VPiece::GetSeamPassmarkSAPoint(const VSAPoint &previousSAPoint, const VSAPo
 {
     SCASSERT(data != nullptr)
 
+    QVector<QPointF> ekvPoints;
     const qreal width = ToPixel(GetSAWidth(), *data->GetPatternUnit());
-    const QVector<QPointF> ekvPoints = EkvPoint(previousSAPoint, passmarkSAPoint, nextSAPoint, passmarkSAPoint, width);
+    if (IsEkvPointOnLine(passmarkSAPoint, previousSAPoint, nextSAPoint)) // see issue #665
+    {
+        QLineF line (passmarkSAPoint, nextSAPoint);
+        line.setAngle(line.angle() + 90);
+        line.setLength(VAbstractPiece::MaxLocalSA(passmarkSAPoint, width));
+        ekvPoints.append(line.p2());
+    }
+    else
+    {
+        ekvPoints = EkvPoint(previousSAPoint, passmarkSAPoint, nextSAPoint, passmarkSAPoint, width);
+    }
 
     if (ekvPoints.isEmpty())
     { // Just in case