diff --git a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
index 5f60abb3de3..04ed017a10e 100644
--- a/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
+++ b/src/mesa/drivers/dri/i965/intel_mipmap_tree.c
@@ -222,8 +222,8 @@ intel_tiling_supports_hiz(const struct brw_context *brw, unsigned tiling)
 }
 
 static bool
-intel_miptree_supports_hiz(struct brw_context *brw,
-                           struct intel_mipmap_tree *mt)
+intel_miptree_supports_hiz(const struct brw_context *brw,
+                           const struct intel_mipmap_tree *mt)
 {
    if (!brw->has_hiz)
       return false;