diff --git a/src/Mod/Sketcher/App/Sketch.cpp b/src/Mod/Sketcher/App/Sketch.cpp
index 4415f2379..0aa497180 100644
--- a/src/Mod/Sketcher/App/Sketch.cpp
+++ b/src/Mod/Sketcher/App/Sketch.cpp
@@ -212,7 +212,7 @@ int Sketch::addGeometry(const Part::Geometry *geo, bool fixed)
         // create the definition struct for that geom
         return addArcOfEllipse(*aoe, fixed);
     } else if (geo->getTypeId() == GeomArcOfHyperbola::getClassTypeId()) { // add an arc of hyperbola
-        const GeomArcOfHyperbola *aoh = dynamic_cast<const GeomArcOfHyperbola*>(geo);
+        const GeomArcOfHyperbola *aoh = static_cast<const GeomArcOfHyperbola*>(geo);
         // create the definition struct for that geom
         return addArcOfHyperbola(*aoh, fixed);
     } else {
diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index e2b1af885..dd9e48aa4 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -497,7 +497,7 @@ Base::Vector3d SketchObject::getPoint(int GeoId, PointPos PosId) const
         else if (PosId == mid)
             return aoc->getCenter();
     } else if (geo->getTypeId() == Part::GeomArcOfHyperbola::getClassTypeId()) {
-        const Part::GeomArcOfHyperbola *aoh = dynamic_cast<const Part::GeomArcOfHyperbola*>(geo);
+        const Part::GeomArcOfHyperbola *aoh = static_cast<const Part::GeomArcOfHyperbola*>(geo);
         if (PosId == start)
             return aoh->getStartPoint();
         else if (PosId == end)
@@ -1729,7 +1729,7 @@ int SketchObject::trim(int GeoId, const Base::Vector3d& point)
         }
         
     } else if (geo->getTypeId() == Part::GeomArcOfHyperbola::getClassTypeId()) {
-        const Part::GeomArcOfHyperbola *aoh = dynamic_cast<const Part::GeomArcOfHyperbola*>(geo);
+        const Part::GeomArcOfHyperbola *aoh = static_cast<const Part::GeomArcOfHyperbola*>(geo);
         Base::Vector3d center = aoh->getCenter();
         double startAngle, endAngle;
         aoh->getRange(startAngle, endAngle, /*emulateCCW=*/true);
@@ -1761,8 +1761,8 @@ int SketchObject::trim(int GeoId, const Base::Vector3d& point)
                     // go through all constraints and replace the point (GeoId,end) with (newGeoId,end)
                     transferConstraints(GeoId, end, newGeoId, end);
 
-                    Part::GeomArcOfHyperbola *aoh1 = dynamic_cast<Part::GeomArcOfHyperbola*>(geomlist[GeoId]);
-                    Part::GeomArcOfHyperbola *aoh2 = dynamic_cast<Part::GeomArcOfHyperbola*>(geomlist[newGeoId]);
+                    Part::GeomArcOfHyperbola *aoh1 = static_cast<Part::GeomArcOfHyperbola*>(geomlist[GeoId]);
+                    Part::GeomArcOfHyperbola *aoh2 = static_cast<Part::GeomArcOfHyperbola*>(geomlist[newGeoId]);
                     aoh1->setRange(startAngle, startAngle + theta1, /*emulateCCW=*/true);
                     aoh2->setRange(startAngle + theta2, endAngle, /*emulateCCW=*/true);
 
diff --git a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
index d6f9ea646..2d4c8f2ac 100644
--- a/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
+++ b/src/Mod/Sketcher/Gui/ViewProviderSketch.cpp
@@ -2178,7 +2178,7 @@ void ViewProviderSketch::doBoxSelection(const SbVec2s &startPos, const SbVec2s &
 
         } else if ((*it)->getTypeId() == Part::GeomArcOfHyperbola::getClassTypeId()) {
             // Check if arc lies inside box selection
-            const Part::GeomArcOfHyperbola *aoh = dynamic_cast<const Part::GeomArcOfHyperbola *>(*it);
+            const Part::GeomArcOfHyperbola *aoh = static_cast<const Part::GeomArcOfHyperbola *>(*it);
 
             pnt0 = aoh->getStartPoint();
             pnt1 = aoh->getEndPoint();
@@ -3548,7 +3548,7 @@ Restart:
                                     angle2plus = (startangle + endangle)/2;
                                     midpos2 = aoe->getCenter();
                                 } else if (geo2->getTypeId() == Part::GeomArcOfHyperbola::getClassTypeId()) {
-                                    const Part::GeomArcOfHyperbola *aoh = dynamic_cast<const Part::GeomArcOfHyperbola *>(geo2);
+                                    const Part::GeomArcOfHyperbola *aoh = static_cast<const Part::GeomArcOfHyperbola *>(geo2);
                                     r2a = aoh->getMajorRadius();
                                     r2b = aoh->getMinorRadius();
                                     double startangle, endangle;