diff --git a/src/mesa/drivers/dri/i915/intel_mipmap_tree.c b/src/mesa/drivers/dri/i915/intel_mipmap_tree.c
index 2723aa0fa94..08ae06a2873 100644
--- a/src/mesa/drivers/dri/i915/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i915/intel_mipmap_tree.c
@@ -73,7 +73,7 @@ struct intel_mipmap_tree *intel_miptree_create( struct intel_context *intel,
    mt->width0 = width0;
    mt->height0 = height0;
    mt->depth0 = depth0;
-   mt->cpp = cpp;
+   mt->cpp = compressed ? 2 : cpp;
    mt->compressed = compressed;
    mt->refcount = 1;