diff --git a/src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp
index d7b59610e..aa42d760f 100644
--- a/src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btHingeConstraint.cpp
@@ -720,7 +720,8 @@ btScalar btHingeConstraint::getHingeAngle(const btTransform& transA,const btTran
 	const btVector3 refAxis0  = transA.getBasis() * m_rbAFrame.getBasis().getColumn(0);
 	const btVector3 refAxis1  = transA.getBasis() * m_rbAFrame.getBasis().getColumn(1);
 	const btVector3 swingAxis = transB.getBasis() * m_rbBFrame.getBasis().getColumn(1);
-	btScalar angle = btAtan2Fast(swingAxis.dot(refAxis0), swingAxis.dot(refAxis1));
+//	btScalar angle = btAtan2Fast(swingAxis.dot(refAxis0), swingAxis.dot(refAxis1));
+	btScalar angle = btAtan2(swingAxis.dot(refAxis0), swingAxis.dot(refAxis1));
 	return m_referenceSign * angle;
 }
 
diff --git a/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp b/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
index 523519f98..c9b2502ef 100755
--- a/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
+++ b/src/BulletDynamics/ConstraintSolver/btSliderConstraint.cpp
@@ -822,7 +822,8 @@ void btSliderConstraint::testAngLimits(void)
 		const btVector3 axisA0 = m_calculatedTransformA.getBasis().getColumn(1);
 		const btVector3 axisA1 = m_calculatedTransformA.getBasis().getColumn(2);
 		const btVector3 axisB0 = m_calculatedTransformB.getBasis().getColumn(1);
-		btScalar rot = btAtan2Fast(axisB0.dot(axisA1), axisB0.dot(axisA0));  
+//		btScalar rot = btAtan2Fast(axisB0.dot(axisA1), axisB0.dot(axisA0));  
+		btScalar rot = btAtan2(axisB0.dot(axisA1), axisB0.dot(axisA0));  
 		rot = btAdjustAngleToLimits(rot, m_lowerAngLimit, m_upperAngLimit);
 		m_angPos = rot;
 		if(rot < m_lowerAngLimit)