diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 9aaf132..b7ab3d8 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -279,6 +279,8 @@
 
   if (LangOpts.Exceptions)
     Builder.defineMacro("__EXCEPTIONS");
+  if (LangOpts.SjLjExceptions)
+    Builder.defineMacro("__USING_SJLJ_EXCEPTIONS__");
 
   if (LangOpts.CPlusPlus) {
     Builder.defineMacro("__DEPRECATED");