diff --git a/libcpp/include/cpplib.h b/libcpp/include/cpplib.h
index 5fb80d9..c15c8f5 100644
--- a/libcpp/include/cpplib.h
+++ b/libcpp/include/cpplib.h
@@ -155,7 +155,7 @@
 
 /* C language kind, used when calling cpp_create_reader.  */
 enum c_lang {CLK_GNUC89 = 0, CLK_GNUC99, CLK_STDC89, CLK_STDC94, CLK_STDC99,
-	     CLK_GNUCXX, CLK_CXX98, CLK_ASM};
+	     CLK_GNUCXX, CLK_CXX98, CLK_GNUCXX0X, CLK_CXX0X, CLK_ASM};
 
 /* Payload of a NUMBER, STRING, CHAR or COMMENT token.  */
 struct cpp_string GTY(())