diff --git a/include/__config b/include/__config
index f6102b202..ae907cfe2 100644
--- a/include/__config
+++ b/include/__config
@@ -90,9 +90,13 @@
 #define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
 
 #ifndef __GXX_EXPERIMENTAL_CXX0X__
+#ifdef __linux__
+#define _LIBCPP_HAS_NO_UNICODE_CHARS
+#else
 typedef __char16_t char16_t;
 typedef __char32_t char32_t;
 #endif
+#endif
 
 #if !(__has_feature(cxx_exceptions))
 #define _LIBCPP_NO_EXCEPTIONS