diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatum.cpp b/src/Mod/PartDesign/Gui/ViewProviderDatum.cpp
index 2fb6a45043..0d7d7d4fe5 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatum.cpp
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatum.cpp
@@ -78,6 +78,9 @@ using namespace PartDesignGui;
 
 PROPERTY_SOURCE(PartDesignGui::ViewProviderDatum,Gui::ViewProviderGeometryObject)
 
+// static data
+const double ViewProviderDatum::defaultSize = Gui::ViewProviderOrigin::defaultSize ();
+
 ViewProviderDatum::ViewProviderDatum()
 {
     pShapeSep = new SoSeparator();
@@ -382,6 +385,6 @@ SbBox3f ViewProviderDatum::getRelevantBoundBox (
 }
 
 SbBox3f ViewProviderDatum::defaultBoundBox () {
-    double defSz = Gui::ViewProviderOrigin::defaultSize ();
-    return SbBox3f ( -defSz, -defSz, -defSz, defSz, defSz, defSz );
+    return SbBox3f ( -defaultSize, -defaultSize, -defaultSize,
+            defaultSize, defaultSize, defaultSize );
 }
diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatum.h b/src/Mod/PartDesign/Gui/ViewProviderDatum.h
index fc8f2bbe3e..863c25f615 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatum.h
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatum.h
@@ -87,11 +87,14 @@ public:
             SoGetBoundingBoxAction &bboxAction,
             const std::vector <App::DocumentObject *> &objs);
 
+    /// Default size used to produce the default bbox
+    static const double defaultSize;
+
     // Returnd default bounding box if relevant is can't be used for some reason
     static SbBox3f defaultBoundBox ();
 
     // Returns a default marging factor (part of size )
-    static double margingFactor () { return 0.1; };
+    static double marginFactor () { return 0.1; };
 
 protected:
     virtual bool setEdit(int ModNum);
diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
index 717b02a9f2..c1bfb3da3c 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatumLine.cpp
@@ -87,7 +87,7 @@ void ViewProviderDatumLine::setExtents (Base::BoundBox3d bbox) {
     // Add origin of the line to the box if it's not
     bbox.Add ( Base::Vector3d (0, 0, 0) );
 
-    double marging = bbox.LengthZ () * margingFactor ();
+    double marging = bbox.LengthZ () * marginFactor ();
 
     // Display the line
     pCoords->point.setNum (2);
diff --git a/src/Mod/PartDesign/Gui/ViewProviderDatumPlane.cpp b/src/Mod/PartDesign/Gui/ViewProviderDatumPlane.cpp
index 26f3c5a8a1..2e3263f3f2 100644
--- a/src/Mod/PartDesign/Gui/ViewProviderDatumPlane.cpp
+++ b/src/Mod/PartDesign/Gui/ViewProviderDatumPlane.cpp
@@ -109,7 +109,7 @@ void ViewProviderDatumPlane::setExtents (Base::BoundBox3d bbox) {
     // Add origin of the plane to the box if it's not
     bbox.Add ( Base::Vector3d (0, 0, 0) );
 
-    double marging = sqrt(bbox.LengthX ()*bbox.LengthY ()) * margingFactor ();
+    double marging = sqrt(bbox.LengthX ()*bbox.LengthY ()) * marginFactor ();
 
     // Change the coordinates of the line
     pCoords->point.setNum (4);