diff --git a/clang/lib/Driver/Driver.cpp b/clang/lib/Driver/Driver.cpp
index 85d76c8c20f8..dc303ad0498c 100644
--- a/clang/lib/Driver/Driver.cpp
+++ b/clang/lib/Driver/Driver.cpp
@@ -33,6 +33,7 @@
 #include <map>
 
 using namespace clang::driver;
+using namespace clang;
 
 Driver::Driver(const char *_Name, const char *_Dir,
                const char *_DefaultHostTriple,