diff --git a/src/BulletCollision/CollisionShapes/btCompoundShape.cpp b/src/BulletCollision/CollisionShapes/btCompoundShape.cpp
index 167dd12e1..9c2b04d18 100644
--- a/src/BulletCollision/CollisionShapes/btCompoundShape.cpp
+++ b/src/BulletCollision/CollisionShapes/btCompoundShape.cpp
@@ -56,8 +56,7 @@ void	btCompoundShape::addChildShape(const btTransform& localTransform,btCollisio
 	child.m_childShapeType = shape->getShapeType();
 	child.m_childMargin = shape->getMargin();
 
-	m_children.push_back(child);
-
+	
 	//extend the local aabbMin/aabbMax
 	btVector3 localAabbMin,localAabbMax;
 	shape->getAabb(localTransform,localAabbMin,localAabbMax);
@@ -76,10 +75,12 @@ void	btCompoundShape::addChildShape(const btTransform& localTransform,btCollisio
 	if (m_dynamicAabbTree)
 	{
 		const btDbvtVolume	bounds=btDbvtVolume::FromMM(localAabbMin,localAabbMax);
-		int index = m_children.size()-1;
+		int index = m_children.size();
 		child.m_node = m_dynamicAabbTree->insert(bounds,(void*)index);
 	}
 
+	m_children.push_back(child);
+
 }
 
 void	btCompoundShape::updateChildTransform(int childIndex, const btTransform& newChildTransform)