diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index daf86fd..218b447 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -6140,6 +6140,9 @@
 
  private:
   static constexpr size_t kFlagIsStringCharAt = kNumberOfGenericPackedBits;
+  static constexpr size_t kNumberOfBoundsCheckPackedBits = kFlagIsStringCharAt + 1;
+  static_assert(kNumberOfBoundsCheckPackedBits <= HInstruction::kMaxNumberOfPackedBits,
+                "Too many packed fields.");
 };
 
 class HSuspendCheck final : public HExpression<0> {