diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 5ef91be..2e2dd71 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -583,6 +583,7 @@
   const LangOptions &LangOpts = PP.getLangOptions();
 
   return llvm::StringSwitch<bool>(II->getName())
+           .Case("address_sanitizer", LangOpts.AddressSanitizer)
            .Case("attribute_analyzer_noreturn", true)
            .Case("attribute_availability", true)
            .Case("attribute_cf_returns_not_retained", true)