diff --git a/utils/TableGen/ClangASTNodesEmitter.cpp b/utils/TableGen/ClangASTNodesEmitter.cpp
index f9366d9e0bc..addc6ba0f93 100644
--- a/utils/TableGen/ClangASTNodesEmitter.cpp
+++ b/utils/TableGen/ClangASTNodesEmitter.cpp
@@ -5,7 +5,7 @@
 #include <string>
 #include <map>
 #include <utility>
-#include <clocale>
+#include <cctype>
 using namespace llvm;
 
 //===----------------------------------------------------------------------===//