diff --git a/src/gallium/drivers/iris/iris_resolve.c b/src/gallium/drivers/iris/iris_resolve.c
index 018a28955f5..37af7920ada 100644
--- a/src/gallium/drivers/iris/iris_resolve.c
+++ b/src/gallium/drivers/iris/iris_resolve.c
@@ -997,6 +997,7 @@ iris_resource_render_aux_usage(struct iris_context *ice,
                                            render_format)) {
          return res->aux.usage;
       }
+      /* fallthrough */
 
    default:
       return ISL_AUX_USAGE_NONE;