diff --git a/vlsisapd/agds/GdsElement.h b/vlsisapd/agds/GdsElement.h
index fb355ef8..38253bd8 100644
--- a/vlsisapd/agds/GdsElement.h
+++ b/vlsisapd/agds/GdsElement.h
@@ -4,7 +4,8 @@
 namespace IO {
 class GdsElement {
     protected:
-        inline GdsElement(int layer);
+        inline   GdsElement (int layer);
+        virtual ~GdsElement ();
 
     public:
         virtual bool write ( ofstream &file ) = 0;
diff --git a/vlsisapd/agds/GdsRectangle.cpp b/vlsisapd/agds/GdsRectangle.cpp
index 4b82a3ee..49478889 100644
--- a/vlsisapd/agds/GdsRectangle.cpp
+++ b/vlsisapd/agds/GdsRectangle.cpp
@@ -5,6 +5,8 @@ using namespace std;
 #include "GdsRectangle.h"
 
 namespace IO {
+GdsElement::~GdsElement () { }
+
 GdsRectangle::GdsRectangle(int layer, double xmin, double ymin, double xmax, double ymax) 
     : GdsElement(layer)
     , _xmin(xmin)
@@ -12,6 +14,8 @@ GdsRectangle::GdsRectangle(int layer, double xmin, double ymin, double xmax, dou
     , _xmax(xmax)
     , _ymax(ymax) {}
 
+GdsRectangle::~GdsRectangle () { }
+
 bool GdsRectangle::write(ofstream &file) {
     file << "BOUNDARY;" << endl
          << "LAYER " << _layer << ";" << endl
diff --git a/vlsisapd/agds/GdsRectangle.h b/vlsisapd/agds/GdsRectangle.h
index 2c9a190e..f2563128 100644
--- a/vlsisapd/agds/GdsRectangle.h
+++ b/vlsisapd/agds/GdsRectangle.h
@@ -8,10 +8,9 @@
 namespace IO {
 class GdsRectangle : public GdsElement {
     public:
-        GdsRectangle(int layer, double xmin, double ymin, double xmax, double ymax);
-
-        virtual bool write ( ofstream &file );
-        
+                      GdsRectangle (int layer, double xmin, double ymin, double xmax, double ymax);
+        virtual      ~GdsRectangle ();
+        virtual bool  write        ( ofstream &file );
     private:
         double _xmin;
         double _ymin;