diff --git a/include/uchar.h b/include/uchar.h
index 8dabf1ed..7e5c4d40 100644
--- a/include/uchar.h
+++ b/include/uchar.h
@@ -3,7 +3,9 @@
 
 #ifdef __cplusplus
 extern "C" {
-#else
+#endif
+
+#if __cplusplus < 201103L
 typedef unsigned short char16_t;
 typedef unsigned char32_t;
 #endif