diff --git a/src/Mod/Sketcher/App/planegcs/Constraints.cpp b/src/Mod/Sketcher/App/planegcs/Constraints.cpp
index 3689497084..cb3612ab41 100644
--- a/src/Mod/Sketcher/App/planegcs/Constraints.cpp
+++ b/src/Mod/Sketcher/App/planegcs/Constraints.cpp
@@ -37,7 +37,7 @@ namespace GCS
 ///////////////////////////////////////
 
 Constraint::Constraint()
-: origpvec(0), pvec(0), scale(1.), tag(0), pvecChangedFlag(true)
+: origpvec(0), pvec(0), scale(1.), tag(0), pvecChangedFlag(true), driving(true)
 {
 }
 
diff --git a/src/Mod/Sketcher/App/planegcs/Constraints.h b/src/Mod/Sketcher/App/planegcs/Constraints.h
index 99b18413bc..49bbf095e3 100644
--- a/src/Mod/Sketcher/App/planegcs/Constraints.h
+++ b/src/Mod/Sketcher/App/planegcs/Constraints.h
@@ -99,6 +99,7 @@ namespace GCS
         double scale;
         int tag;
         bool pvecChangedFlag;  //indicates that pvec has changed and saved pointers must be reconstructed (currently used only in AngleViaPoint)
+        bool driving;
     public:
         Constraint();
         virtual ~Constraint(){}
@@ -109,6 +110,9 @@ namespace GCS
         void revertParams();
         void setTag(int tagId) { tag = tagId; }
         int getTag() { return tag; }
+        
+        void setDriving(bool isdriving) { driving = isdriving; }
+        bool isDriving() { return driving; }
 
         virtual ConstraintType getTypeId();
         virtual void rescale(double coef=1.);