diff --git a/src/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp
index 9b0d40d5e..e4aa00e96 100644
--- a/src/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btGeneric6DofConstraint.cpp
@@ -53,6 +53,7 @@ btGeneric6DofConstraint::btGeneric6DofConstraint(btRigidBody& rbB, const btTrans
         : btTypedConstraint(D6_CONSTRAINT_TYPE, getFixedBody(), rbB),
 		m_frameInB(frameInB),
 		m_useLinearReferenceFrameA(useLinearReferenceFrameB),
+		m_useOffsetForConstraintFrame(D6_USE_FRAME_OFFSET),
 		m_flags(0),
 		m_useSolveConstraintObsolete(false)
 {
diff --git a/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
index 37e812d6a..1b1d8957d 100755
--- a/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
@@ -71,6 +71,8 @@ void btSliderConstraint::initParams()
 	m_flags = 0;
 	m_flags = 0;
 
+	m_useOffsetForConstraintFrame = USE_OFFSET_FOR_CONSTANT_FRAME;
+
 	calculateTransforms(m_rbA.getCenterOfMassTransform(),m_rbB.getCenterOfMassTransform());
 }