diff --git a/src/gallium/drivers/iris/iris_resource.c b/src/gallium/drivers/iris/iris_resource.c
index 348665d6332..c4b480be566 100644
--- a/src/gallium/drivers/iris/iris_resource.c
+++ b/src/gallium/drivers/iris/iris_resource.c
@@ -1003,18 +1003,12 @@ iris_resource_finish_aux_import(struct pipe_screen *pscreen,
       if (num_main_planes == 1 && num_planes == 2) {
          import_aux_info(r[0], r[1]);
          map_aux_addresses(screen, r[0], format, 0);
-      } else if (num_main_planes == 2 && num_planes == 4) {
+      } else {
+         assert(num_main_planes == 2 && num_planes == 4);
          import_aux_info(r[0], r[2]);
          import_aux_info(r[1], r[3]);
          map_aux_addresses(screen, r[0], format, 0);
          map_aux_addresses(screen, r[1], format, 1);
-      } else {
-         /* Gallium has lowered a single main plane into two. */
-         assert(num_main_planes == 2 && num_planes == 3);
-         assert(isl_format_is_yuv(format) && !isl_format_is_planar(format));
-         import_aux_info(r[0], r[2]);
-         import_aux_info(r[1], r[2]);
-         map_aux_addresses(screen, r[0], format, 0);
       }
       assert(!isl_aux_usage_has_fast_clears(res->mod_info->aux_usage));
       break;