diff --git a/compiler/cpp/src/thriftl.ll b/compiler/cpp/src/thriftl.ll
index 855443b..d54a2ad 100644
--- a/compiler/cpp/src/thriftl.ll
+++ b/compiler/cpp/src/thriftl.ll
@@ -61,6 +61,7 @@
 "php_namespace" { return tok_php_namespace; }
 "xsd_all"       { return tok_xsd_all;       }
 "xsd_optional"  { return tok_xsd_optional;  }
+"xsd_namespace" { return tok_xsd_namespace; }
 "include"       { return tok_include;       }
 
 "void"          { return tok_void;          }