diff --git a/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.cpp
index d35034566..2b3871498 100644
--- a/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.cpp
@@ -20,6 +20,19 @@ subject to the following restrictions:
 
 btGeneric6DofSpringConstraint::btGeneric6DofSpringConstraint(btRigidBody& rbA, btRigidBody& rbB, const btTransform& frameInA, const btTransform& frameInB ,bool useLinearReferenceFrameA)
 	: btGeneric6DofConstraint(rbA, rbB, frameInA, frameInB, useLinearReferenceFrameA)
+{
+    init();
+}
+
+
+btGeneric6DofSpringConstraint::btGeneric6DofSpringConstraint(btRigidBody& rbB, const btTransform& frameInB, bool useLinearReferenceFrameB)
+        : btGeneric6DofConstraint(rbB, frameInB, useLinearReferenceFrameB)
+{
+    init();
+}
+
+
+void btGeneric6DofSpringConstraint::init()
 {
 	m_objectType = D6_SPRING_CONSTRAINT_TYPE;
 
diff --git a/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.h b/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.h
index b3f2ef8f3..31e0cd531 100644
--- a/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.h
+++ b/src/BulletDynamics/ConstraintSolver/btGeneric6DofSpringConstraint.h
@@ -39,9 +39,11 @@ protected:
 	btScalar	m_equilibriumPoint[6];
 	btScalar	m_springStiffness[6];
 	btScalar	m_springDamping[6]; // between 0 and 1 (1 == no damping)
+	void init();
 	void internalUpdateSprings(btConstraintInfo2* info);
 public: 
     btGeneric6DofSpringConstraint(btRigidBody& rbA, btRigidBody& rbB, const btTransform& frameInA, const btTransform& frameInB ,bool useLinearReferenceFrameA);
+    btGeneric6DofSpringConstraint(btRigidBody& rbB, const btTransform& frameInB, bool useLinearReferenceFrameB);
 	void enableSpring(int index, bool onOff);
 	void setStiffness(int index, btScalar stiffness);
 	void setDamping(int index, btScalar damping);