diff --git a/src/Mod/PartDesign/App/DatumLine.cpp b/src/Mod/PartDesign/App/DatumLine.cpp
index f59e93220..37c7c5b31 100644
--- a/src/Mod/PartDesign/App/DatumLine.cpp
+++ b/src/Mod/PartDesign/App/DatumLine.cpp
@@ -130,8 +130,6 @@ Line::~Line()
 
 void Line::onChanged(const App::Property *prop)
 {
-    Datum::onChanged(prop);
-
     if (prop == &References) {
         refTypes.clear();
         std::vector<App::DocumentObject*> refs = References.getValues();
diff --git a/src/Mod/PartDesign/App/DatumPlane.cpp b/src/Mod/PartDesign/App/DatumPlane.cpp
index 6c7691388..f42f71339 100644
--- a/src/Mod/PartDesign/App/DatumPlane.cpp
+++ b/src/Mod/PartDesign/App/DatumPlane.cpp
@@ -153,8 +153,6 @@ ADD_PROPERTY_TYPE(_Normal,(Base::Vector3d(1,1,1)),"DatumPlane",
 
 void Plane::onChanged(const App::Property *prop)
 {
-    Datum::onChanged(prop);
-
     if (prop == &Angle) {
         // Zero value counts as angle not defined
         if (fabs(Angle.getValue()) > Precision::Confusion())
diff --git a/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp b/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
index 132427f93..bdb55c015 100644
--- a/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
@@ -111,7 +111,7 @@ TaskDatumParameters::TaskDatumParameters(ViewProviderDatum *DatumView,QWidget *p
     connect(ui->spinAngle, SIGNAL(valueChanged(double)),
             this, SLOT(onAngleChanged(double)));
     connect(ui->checkBoxFlip, SIGNAL(toggled(bool)),
-            this, SLOT(onCheckBox1(bool)));
+            this, SLOT(onCheckFlip(bool)));
     connect(ui->buttonRef1, SIGNAL(pressed()),
             this, SLOT(onButtonRef1()));
     connect(ui->lineRef1, SIGNAL(textEdited(QString)),