diff --git a/src/SketchTool.cpp b/src/SketchTool.cpp
index 918e209..b55efb0 100644
--- a/src/SketchTool.cpp
+++ b/src/SketchTool.cpp
@@ -16,7 +16,7 @@ void SketchTool::deactivate()
 {
     m_isDefining = false;
     for (const QString& propName : m_dimensionPropertyNames.values()) {
-        m_viewport->setProperty(propName, "");
+        m_viewport->setProperty(propName.toUtf8().constData(), "");
     }
     m_dimensionModes.clear();
     m_dimensionPropertyNames.clear();
@@ -41,24 +41,24 @@ void SketchTool::keyPressEvent(QKeyEvent *event)
         QString editMode = m_viewport->property("dimensionEditMode").toString();
         if (m_dimensionPropertyNames.contains(editMode)) {
             QString propertyName = m_dimensionPropertyNames[editMode];
-            QString currentInput = m_viewport->property(propertyName).toString();
+            QString currentInput = m_viewport->property(propertyName.toUtf8().constData()).toString();
 
             if (event->key() >= Qt::Key_0 && event->key() <= Qt::Key_9) {
                 currentInput += event->text();
-                m_viewport->setProperty(propertyName, currentInput);
+                m_viewport->setProperty(propertyName.toUtf8().constData(), currentInput);
                 m_viewport->update();
                 return;
             } else if (event->key() == Qt::Key_Period) {
                 if (!currentInput.contains('.')) {
                     currentInput += '.';
-                    m_viewport->setProperty(propertyName, currentInput);
+                    m_viewport->setProperty(propertyName.toUtf8().constData(), currentInput);
                     m_viewport->update();
                 }
                 return;
             } else if (event->key() == Qt::Key_Backspace) {
                 if (!currentInput.isEmpty()) {
                     currentInput.chop(1);
-                    m_viewport->setProperty(propertyName, currentInput);
+                    m_viewport->setProperty(propertyName.toUtf8().constData(), currentInput);
                     m_viewport->update();
                 }
                 return;