diff --git a/tools/cpp-define-generator/constant_globals.def b/tools/cpp-define-generator/constant_globals.def
index 1e24d64..a3ccc72 100644
--- a/tools/cpp-define-generator/constant_globals.def
+++ b/tools/cpp-define-generator/constant_globals.def
@@ -25,6 +25,7 @@
 
 DEFINE_OBJECT_EXPR(ALIGNMENT_MASK,         size_t,   art::kObjectAlignment - 1)
 DEFINE_OBJECT_EXPR(ALIGNMENT_MASK_TOGGLED, uint32_t, ~static_cast<uint32_t>(art::kObjectAlignment - 1))
+DEFINE_OBJECT_EXPR(ALIGNMENT_MASK_TOGGLED64, uint64_t, ~static_cast<uint64_t>(art::kObjectAlignment - 1))
 
 #undef DEFINE_OBJECT_EXPR