diff --git a/OpenSim/Region/Physics/BulletSPlugin/BulletSimAPI.cs b/OpenSim/Region/Physics/BulletSPlugin/BulletSimAPI.cs
index e60a7604a8..12baee9ff5 100644
--- a/OpenSim/Region/Physics/BulletSPlugin/BulletSimAPI.cs
+++ b/OpenSim/Region/Physics/BulletSPlugin/BulletSimAPI.cs
@@ -287,6 +287,8 @@ public struct ConfigurationParameters
     public float terrainFriction;
     public float terrainHitFraction;
     public float terrainRestitution;
+    public float terrainCollisionMargin;
+
     public float avatarFriction;
     public float avatarStandingFriction;
     public float avatarDensity;
@@ -296,6 +298,8 @@ public struct ConfigurationParameters
     public float avatarCapsuleHeight;
 	public float avatarContactProcessingThreshold;
 
+    public float vehicleAngularDamping;
+
 	public float maxPersistantManifoldPoolSize;
 	public float maxCollisionAlgorithmPoolSize;
 	public float shouldDisableContactPoolDynamicAllocation;
@@ -481,6 +485,9 @@ public static extern IntPtr BuildNativeShape2(IntPtr world, ShapeData shapeData)
 [DllImport("BulletSim", CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
 public static extern bool IsNativeShape2(IntPtr shape);
 
+[DllImport("BulletSim", CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
+public static extern void SetShapeCollisionMargin(IntPtr shape, float margin);
+
 [DllImport("BulletSim", CallingConvention = CallingConvention.Cdecl), SuppressUnmanagedCodeSecurity]
 public static extern IntPtr BuildCapsuleShape2(IntPtr world, float radius, float height, Vector3 scale);