diff --git a/src/BulletSoftBody/btDeformableBackwardEulerObjective.cpp b/src/BulletSoftBody/btDeformableBackwardEulerObjective.cpp
index 1dee17be8..41b1f74c7 100644
--- a/src/BulletSoftBody/btDeformableBackwardEulerObjective.cpp
+++ b/src/BulletSoftBody/btDeformableBackwardEulerObjective.cpp
@@ -24,6 +24,11 @@ btDeformableBackwardEulerObjective::btDeformableBackwardEulerObjective(btAligned
     m_preconditioner = new DefaultPreconditioner();
 }
 
+btDeformableBackwardEulerObjective::~btDeformableBackwardEulerObjective()
+{
+    delete m_preconditioner;
+}
+
 void btDeformableBackwardEulerObjective::reinitialize(bool nodeUpdated, btScalar dt)
 {
     BT_PROFILE("reinitialize");
diff --git a/src/BulletSoftBody/btDeformableBackwardEulerObjective.h b/src/BulletSoftBody/btDeformableBackwardEulerObjective.h
index cf8ba9920..e028564c5 100644
--- a/src/BulletSoftBody/btDeformableBackwardEulerObjective.h
+++ b/src/BulletSoftBody/btDeformableBackwardEulerObjective.h
@@ -26,13 +26,11 @@
 #include "btDeformableMultiBodyDynamicsWorld.h"
 #include "LinearMath/btQuickprof.h"
 
-//class btDeformableMultiBodyDynamicsWorld;
 class btDeformableBackwardEulerObjective
 {
 public:
     typedef btAlignedObjectArray<btVector3> TVStack;
     btScalar m_dt;
-//    btDeformableMultiBodyDynamicsWorld* m_world;
     btAlignedObjectArray<btDeformableLagrangianForce*> m_lf;
     btAlignedObjectArray<btSoftBody *>& m_softBodies;
     Preconditioner* m_preconditioner;
@@ -41,7 +39,7 @@ public:
     btAlignedObjectArray<btSoftBody::Node* > m_nodes;
     btDeformableBackwardEulerObjective(btAlignedObjectArray<btSoftBody *>& softBodies, const TVStack& backup_v);
     
-    virtual ~btDeformableBackwardEulerObjective() {}
+    virtual ~btDeformableBackwardEulerObjective();
     
     void initialize(){}
     
diff --git a/src/BulletSoftBody/btPreconditioner.h b/src/BulletSoftBody/btPreconditioner.h
index 15ee949a5..32d697a63 100644
--- a/src/BulletSoftBody/btPreconditioner.h
+++ b/src/BulletSoftBody/btPreconditioner.h
@@ -22,6 +22,7 @@ public:
     typedef btAlignedObjectArray<btVector3> TVStack;
     virtual void operator()(const TVStack& x, TVStack& b) = 0;
     virtual void reinitialize(bool nodeUpdated) = 0;
+    virtual ~Preconditioner(){}
 };
 
 class DefaultPreconditioner : public Preconditioner
@@ -35,8 +36,9 @@ public:
     }
     virtual void reinitialize(bool nodeUpdated)
     {
-        
     }
+    
+    virtual ~DefaultPreconditioner(){}
 };
 
 class MassPreconditioner : public Preconditioner