diff --git a/dlls/ddraw/device.c b/dlls/ddraw/device.c
index dd7d3ee5a54..6cc25ba7ea4 100644
--- a/dlls/ddraw/device.c
+++ b/dlls/ddraw/device.c
@@ -4063,7 +4063,7 @@ static HRESULT d3d_device7_DrawIndexedPrimitiveVB(IDirect3DDevice7 *iface,
 
         TRACE("Growing index buffer to %u bytes\n", size);
 
-        hr = wined3d_buffer_create_ib(This->wined3d_device, size, WINED3DUSAGE_DYNAMIC /* Usage */,
+        hr = wined3d_buffer_create_ib(This->wined3d_device, size, WINED3DUSAGE_DYNAMIC | WINED3DUSAGE_WRITEONLY,
                 WINED3D_POOL_DEFAULT, NULL, &ddraw_null_wined3d_parent_ops, &buffer);
         if (FAILED(hr))
         {