diff --git a/src/Mod/Sketcher/App/SketchObject.cpp b/src/Mod/Sketcher/App/SketchObject.cpp
index 27df5de63..2d208284c 100644
--- a/src/Mod/Sketcher/App/SketchObject.cpp
+++ b/src/Mod/Sketcher/App/SketchObject.cpp
@@ -144,6 +144,29 @@ int SketchObject::hasConflicts(void) const
     return 0;
 }
 
+int SketchObject::solve()
+{
+    // set up a sketch (including dofs counting and diagnosing of conflicts)
+    Sketch sketch;
+    int dofs = sketch.setUpSketch(getCompleteGeometry(), Constraints.getValues(),
+                                  getExternalGeometryCount());
+    int err=0;
+    if (dofs < 0) // over-constrained sketch
+        err = -3;
+    else if (sketch.hasConflicts()) // conflicting constraints
+        err = -3;
+    else if (sketch.solve() != 0) // solving
+        err = -2;
+
+    if (err == 0) {
+        // set the newly solved geometry
+        std::vector<Part::Geometry *> geomlist = sketch.extractGeometry();
+        Geometry.setValues(geomlist);
+        for (std::vector<Part::Geometry *>::iterator it = geomlist.begin(); it != geomlist.end(); ++it)
+            if (*it) delete *it;
+    }
+}
+
 int SketchObject::setDatum(int ConstrId, double Datum)
 {
     // set the changed value for the constraint
@@ -170,26 +193,8 @@ int SketchObject::setDatum(int ConstrId, double Datum)
     this->Constraints.setValues(newVals);
     delete constNew;
 
-    // set up a sketch (including dofs counting and diagnosing of conflicts)
-    Sketch sketch;
-    int dofs = sketch.setUpSketch(getCompleteGeometry(), Constraints.getValues(),
-                                  getExternalGeometryCount());
-    int err=0;
-    if (dofs < 0) // over-constrained sketch
-        err = -3;
-    else if (sketch.hasConflicts()) // conflicting constraints
-        err = -3;
-    else if (sketch.solve() != 0) // solving
-        err = -2;
-
-    if (err == 0) {
-        // set the newly solved geometry
-        std::vector<Part::Geometry *> geomlist = sketch.extractGeometry();
-        Geometry.setValues(geomlist);
-        for (std::vector<Part::Geometry *>::iterator it = geomlist.begin(); it != geomlist.end(); ++it)
-            if (*it) delete *it;
-    }
-    else
+    int err = solve();
+    if (err)
         this->Constraints.setValues(vals);
 
     return err;
diff --git a/src/Mod/Sketcher/App/SketchObject.h b/src/Mod/Sketcher/App/SketchObject.h
index 916bde006..0cd4af863 100644
--- a/src/Mod/Sketcher/App/SketchObject.h
+++ b/src/Mod/Sketcher/App/SketchObject.h
@@ -104,6 +104,8 @@ public:
     /// returns non zero if the sketch contains conflicting constraints
     int hasConflicts(void) const;
 
+    /// solves the sketch and updates the Geometry
+    int solve();
     /// set the datum of a Distance or Angle constraint and solve
     int setDatum(int ConstrId, double Datum);
     /// move this point to a new location and solve
diff --git a/src/Mod/Sketcher/App/SketchObjectPyImp.cpp b/src/Mod/Sketcher/App/SketchObjectPyImp.cpp
index 5f093872f..c02684585 100644
--- a/src/Mod/Sketcher/App/SketchObjectPyImp.cpp
+++ b/src/Mod/Sketcher/App/SketchObjectPyImp.cpp
@@ -107,7 +107,9 @@ PyObject* SketchObjectPy::addConstraint(PyObject *args)
 
     if (PyObject_TypeCheck(pcObj, &(Sketcher::ConstraintPy::Type))) {
         Sketcher::Constraint *constr = static_cast<Sketcher::ConstraintPy*>(pcObj)->getConstraintPtr();
-        return Py::new_reference_to(Py::Int(this->getSketchObjectPtr()->addConstraint(constr)));
+        int ret = this->getSketchObjectPtr()->addConstraint(constr);
+        this->getSketchObjectPtr()->solve();
+        return Py::new_reference_to(Py::Int(ret));
     }
     Py_Return;
 }