diff --git a/gm/gm.h b/gm/gm.h
index ac9da26..e48f772 100644
--- a/gm/gm.h
+++ b/gm/gm.h
@@ -45,6 +45,8 @@
             kGPUOnly_Flag               = 1 << 9,
 
             kAsBench_Flag               = 1 << 10, // Run the GM as a benchmark in the bench tool
+
+            kNoBBH_Flag                 = 1 << 11, // May draw wrong using a bounding-box hierarchy
         };
 
         enum Mode {