diff --git a/src/Mod/Assembly/Gui/ViewProviderConstraint.cpp b/src/Mod/Assembly/Gui/ViewProviderConstraint.cpp
index d5c49cf62..d7c5ed700 100644
--- a/src/Mod/Assembly/Gui/ViewProviderConstraint.cpp
+++ b/src/Mod/Assembly/Gui/ViewProviderConstraint.cpp
@@ -105,7 +105,7 @@ void ViewProviderConstraintInternal::switch_node(bool onoff)
 
 PROPERTY_SOURCE(AssemblyGui::ViewProviderConstraint, PartGui::ViewProviderPart)
 
-ViewProviderConstraint::ViewProviderConstraint()
+ViewProviderConstraint::ViewProviderConstraint() : m_selected(false)
 {
     Selectable.setValue(false);