diff --git a/src/Gui/DAGView/DAGModelGraph.h b/src/Gui/DAGView/DAGModelGraph.h
index 894c6c284..e072cb71f 100644
--- a/src/Gui/DAGView/DAGModelGraph.h
+++ b/src/Gui/DAGView/DAGModelGraph.h
@@ -151,7 +151,7 @@ namespace Gui
       void operator()(std::ostream& out, const VertexW& vertexW) const
       {
         out << "[label=\"";
-        out << graphVW[vertexW].text->toPlainText().toAscii().data(); 
+        out << graphVW[vertexW].text->toPlainText().toLatin1().data(); 
         out << "\"]";
       }
     private:
diff --git a/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp b/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
index 8c038af25..0ee984834 100644
--- a/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskDatumParameters.cpp
@@ -107,7 +107,7 @@ void TaskDatumParameters::makeRefStrings(std::vector<QString>& refstrings, std::
 }
 
 TaskDatumParameters::TaskDatumParameters(ViewProviderDatum *DatumView,QWidget *parent)
-    : TaskBox(Gui::BitmapFactory().pixmap((QString::fromAscii("PartDesign_") + DatumView->datumType).toAscii()),
+    : TaskBox(Gui::BitmapFactory().pixmap((QString::fromAscii("PartDesign_") + DatumView->datumType).toLatin1()),
               DatumView->datumType + tr(" parameters"), true, parent),
       DatumView(DatumView)
 {
@@ -597,7 +597,7 @@ void TaskDatumParameters::onRefName(const QString& text, unsigned idx)
     if (parts.length() < 2)
         parts.push_back(QString::fromAscii(""));
     // Check whether this is the name of an App::Plane or Part::Datum feature
-    App::DocumentObject* obj = DatumView->getObject()->getDocument()->getObject(parts[0].toAscii());
+    App::DocumentObject* obj = DatumView->getObject()->getDocument()->getObject(parts[0].toLatin1());
     if (obj == NULL) return;
 
     std::string subElement;
diff --git a/src/Mod/PartDesign/Gui/TaskFeaturePick.cpp b/src/Mod/PartDesign/Gui/TaskFeaturePick.cpp
index 822204855..7337f8f0e 100644
--- a/src/Mod/PartDesign/Gui/TaskFeaturePick.cpp
+++ b/src/Mod/PartDesign/Gui/TaskFeaturePick.cpp
@@ -198,7 +198,7 @@ std::vector<App::DocumentObject*> TaskFeaturePick::getFeatures() {
     std::vector<App::DocumentObject*> result;
 
     for (std::vector<QString>::const_iterator s = features.begin(); s != features.end(); s++)
-        result.push_back(App::GetApplication().getActiveDocument()->getObject(s->toAscii().data()));
+        result.push_back(App::GetApplication().getActiveDocument()->getObject(s->toLatin1().data()));
 
     return result;
 }
@@ -217,7 +217,7 @@ std::vector<App::DocumentObject*> TaskFeaturePick::buildFeatures() {
 
             QString t = item->text();
             t = t.left(t.indexOf(QString::fromAscii("(")) - 1);
-            auto obj = App::GetApplication().getActiveDocument()->getObject(t.toAscii().data());
+            auto obj = App::GetApplication().getActiveDocument()->getObject(t.toLatin1().data());
 
             //build the dependend copy or reference if wanted by the user
             if(*st == otherBody  ||
diff --git a/src/Mod/PartDesign/Gui/TaskSketchBasedParameters.cpp b/src/Mod/PartDesign/Gui/TaskSketchBasedParameters.cpp
index 2f7745d4a..50e7ebcb0 100644
--- a/src/Mod/PartDesign/Gui/TaskSketchBasedParameters.cpp
+++ b/src/Mod/PartDesign/Gui/TaskSketchBasedParameters.cpp
@@ -136,7 +136,7 @@ const QByteArray TaskSketchBasedParameters::onFaceName(const QString& text)
     if (parts.length() < 2)
         parts.push_back(QString::fromAscii(""));
     // Check whether this is the name of an App::Plane or Part::Datum feature
-    App::DocumentObject* obj = vp->getObject()->getDocument()->getObject(parts[0].toAscii());
+    App::DocumentObject* obj = vp->getObject()->getDocument()->getObject(parts[0].toLatin1());
     if (obj == NULL)
         return QByteArray();