diff --git a/gcc/cppbuiltin.c b/gcc/cppbuiltin.c
index 05d82f5..c3ca21a 100644
--- a/gcc/cppbuiltin.c
+++ b/gcc/cppbuiltin.c
@@ -91,6 +91,9 @@ define_builtin_macros_for_compilation_flags
(cpp_reader *pfile)
       cpp_define_formatted (pfile, "__PIE__=%d", flag_pie);
     }

+  if (flag_asan)
+    cpp_define (pfile, "__SANITIZE_ADDRESS__");
+
   if (optimize_size)
     cpp_define (pfile, "__OPTIMIZE_SIZE__");