diff --git a/build/boost/doc/mock.qbk b/build/boost/doc/mock.qbk
index 1d47bf2..2a1abcd 100644
--- a/build/boost/doc/mock.qbk
+++ b/build/boost/doc/mock.qbk
@@ -520,7 +520,7 @@ The policy can then be activated by defining MOCK_ERROR_POLICY prior to includin
 
 [endsect]
 
-[xinclude reference.xml]
+[/ [xinclude reference.xml] ]
 
 [section Patterns]