diff --git a/dlls/d3dx9_36/d3dx9_36.spec b/dlls/d3dx9_36/d3dx9_36.spec
index 2534acfab05..6ce5643a068 100644
--- a/dlls/d3dx9_36/d3dx9_36.spec
+++ b/dlls/d3dx9_36/d3dx9_36.spec
@@ -17,7 +17,7 @@
 @ stub D3DXCompileShaderFromResourceA
 @ stub D3DXCompileShaderFromResourceW
 @ stdcall D3DXComputeBoundingBox(ptr long long ptr ptr)
-@ stub D3DXComputeBoundingSphere
+@ stdcall D3DXComputeBoundingSphere(ptr long long ptr ptr)
 @ stub D3DXComputeIMTFromPerTexelSignal
 @ stub D3DXComputeIMTFromPerVertexSignal
 @ stub D3DXComputeIMTFromSignal
diff --git a/dlls/d3dx9_36/mesh.c b/dlls/d3dx9_36/mesh.c
index 08d6e2f7d47..521d6942d4a 100644
--- a/dlls/d3dx9_36/mesh.c
+++ b/dlls/d3dx9_36/mesh.c
@@ -54,6 +54,40 @@ HRESULT WINAPI D3DXComputeBoundingBox(CONST D3DXVECTOR3 *pfirstposition, DWORD n
     return D3D_OK;
 }
 
+/*************************************************************************
+ * D3DXComputeBoundingSphere
+ */
+HRESULT WINAPI D3DXComputeBoundingSphere(CONST D3DXVECTOR3* pfirstposition, DWORD numvertices, DWORD dwstride, D3DXVECTOR3 *pcenter, FLOAT *pradius)
+{
+    D3DXVECTOR3 temp, temp1;
+    FLOAT d;
+    unsigned int i;
+
+    if( !pfirstposition || !pcenter || !pradius ) return D3DERR_INVALIDCALL;
+
+    temp.x = 0.0f;
+    temp.y = 0.0f;
+    temp.z = 0.0f;
+    temp1 = temp;
+    d = 0.0f;
+    *pradius = 0.0f;
+
+    for(i=0; i<numvertices; i++)
+    {
+        D3DXVec3Add(&temp1, &temp, (D3DXVECTOR3*)((char*)pfirstposition + dwstride * i));
+        temp = temp1;
+    }
+
+    D3DXVec3Scale(pcenter, &temp, 1.0f/((FLOAT)numvertices));
+
+    for(i=0; i<numvertices; i++)
+    {
+        d = D3DXVec3Length(D3DXVec3Subtract(&temp, (D3DXVECTOR3*)((char*)pfirstposition + dwstride * i), pcenter));
+        if ( d > *pradius ) *pradius = d;
+    }
+    return D3D_OK;
+}
+
 /*************************************************************************
  * D3DXIntersectTri
  */
diff --git a/include/d3dx9mesh.h b/include/d3dx9mesh.h
index 5cfc25ee0e3..a85f80de58b 100644
--- a/include/d3dx9mesh.h
+++ b/include/d3dx9mesh.h
@@ -30,6 +30,7 @@ UINT    WINAPI D3DXGetFVFVertexSize(DWORD);
 BOOL    WINAPI D3DXBoxBoundProbe(CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *);
 BOOL    WINAPI D3DXSphereBoundProbe(CONST D3DXVECTOR3 *,FLOAT,CONST D3DXVECTOR3 *,CONST D3DXVECTOR3 *);
 HRESULT WINAPI D3DXComputeBoundingBox(CONST D3DXVECTOR3 *, DWORD, DWORD, D3DXVECTOR3 *, D3DXVECTOR3 *);
+HRESULT WINAPI D3DXComputeBoundingSphere(CONST D3DXVECTOR3 *, DWORD, DWORD, D3DXVECTOR3 *, FLOAT *);
 BOOL    WINAPI D3DXIntersectTri(CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *, CONST D3DXVECTOR3 *, CONST D3DXVECTOR3*, FLOAT *, FLOAT *, FLOAT *);
 
 #ifdef __cplusplus