diff --git a/src/Mod/TechDraw/App/DrawDimHelper.cpp b/src/Mod/TechDraw/App/DrawDimHelper.cpp
index 45470aa991..250c069971 100644
--- a/src/Mod/TechDraw/App/DrawDimHelper.cpp
+++ b/src/Mod/TechDraw/App/DrawDimHelper.cpp
@@ -34,6 +34,8 @@
 #include <Precision.hxx>
 #include <Bnd_Box2d.hxx>
 #include <BndLib_Add2dCurve.hxx>
+#include <Bnd_Box.hxx>
+#include <BRepBndLib.hxx>
 #include <Extrema_ExtCC2d.hxx>
 #include <Geom2dAdaptor_Curve.hxx>
 #include <Geom2d_Curve.hxx>
@@ -185,10 +187,14 @@ std::pair<Base::Vector3d, Base::Vector3d> DrawDimHelper::minMax(DrawViewPart* dv
         selEdges = dvp->getEdgeGeometry();                  //do the whole View
     }
 
+    Bnd_Box edgeBbx;
+    edgeBbx.SetGap(0.0);
+
     std::vector<Handle(Geom_Curve)> selCurves;
     std::vector<hTrimCurve> hTCurve2dList;
     for (auto& bg: selEdges) {
         TopoDS_Edge e = bg->occEdge;
+        BRepBndLib::Add(e, edgeBbx);
         double first = 0.0;
         double last = 0.0;
         Handle(Geom_Curve) hCurve = BRep_Tool::Curve(e, first, last);
@@ -198,19 +204,18 @@ std::pair<Base::Vector3d, Base::Vector3d> DrawDimHelper::minMax(DrawViewPart* dv
     }
 
     //can't use Bnd_Box2d here as BndLib_Add2dCurve::Add adds the poles of splines to the box.
-    //poles are not necessarily on the curve! 3d Bnd_Box does it properly. FC bbx3 is already calculated
-    //bbx3 is scaled??
-//    double scale = dvp->getScale();
+    //poles are not necessarily on the curve! 3d Bnd_Box does it properly. 
+    //this has to be the bbx of the selected edges, not the dvp!!!
+    double minX, minY, minZ, maxX, maxY, maxZ;
+    edgeBbx.Get(minX, minY, minZ, maxX, maxY, maxZ);
+    double xMid = (maxX + minX) / 2.0;
+    double yMid = (maxY + minY) / 2.0;
 
-    Base::BoundBox3d bbx3 = dvp->getBoundingBox();
+    gp_Pnt2d rightMid(maxX, yMid);
+    gp_Pnt2d leftMid(minX, yMid);
+    gp_Pnt2d topMid(xMid, maxY);
+    gp_Pnt2d bottomMid(xMid, minY);
 
-    double xMid = (bbx3.MaxX + bbx3.MinX) / 2.0;
-    double yMid = (bbx3.MaxY + bbx3.MinY) / 2.0;
-
-    gp_Pnt2d rightMid(bbx3.MaxX, yMid);
-    gp_Pnt2d leftMid(bbx3.MinX, yMid);
-    gp_Pnt2d topMid(xMid, bbx3.MaxY);
-    gp_Pnt2d bottomMid(xMid, bbx3.MinY);
     gp_Dir2d xDir(1.0, 0.0);
     gp_Dir2d yDir(0.0, 1.0);