diff --git a/src/Bullet3Dynamics/ConstraintSolver/b3TypedConstraint.cpp b/src/Bullet3Dynamics/ConstraintSolver/b3TypedConstraint.cpp
index dad4d5f82..699c481d6 100644
--- a/src/Bullet3Dynamics/ConstraintSolver/b3TypedConstraint.cpp
+++ b/src/Bullet3Dynamics/ConstraintSolver/b3TypedConstraint.cpp
@@ -25,7 +25,7 @@ subject to the following restrictions:
 b3TypedConstraint::b3TypedConstraint(b3TypedConstraintType type, int rbA,int rbB)
 :b3TypedObject(type),
 m_userConstraintType(-1),
-m_userConstraintId(-1),
+m_userConstraintPtr((void*)-1),
 m_breakingImpulseThreshold(B3_INFINITY),
 m_isEnabled(true),
 m_needsFeedback(false),
diff --git a/src/BulletDynamics/ConstraintSolver/btTypedConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btTypedConstraint.cpp
index 27fdd9d3d..736a64a1c 100644
--- a/src/BulletDynamics/ConstraintSolver/btTypedConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btTypedConstraint.cpp
@@ -24,7 +24,7 @@ subject to the following restrictions:
 btTypedConstraint::btTypedConstraint(btTypedConstraintType type, btRigidBody& rbA)
 :btTypedObject(type),
 m_userConstraintType(-1),
-m_userConstraintId(-1),
+m_userConstraintPtr((void*)-1),
 m_breakingImpulseThreshold(SIMD_INFINITY),
 m_isEnabled(true),
 m_needsFeedback(false),
@@ -41,7 +41,7 @@ m_jointFeedback(0)
 btTypedConstraint::btTypedConstraint(btTypedConstraintType type, btRigidBody& rbA,btRigidBody& rbB)
 :btTypedObject(type),
 m_userConstraintType(-1),
-m_userConstraintId(-1),
+m_userConstraintPtr((void*)-1),
 m_breakingImpulseThreshold(SIMD_INFINITY),
 m_isEnabled(true),
 m_needsFeedback(false),