diff --git a/testing/examples/ob-C-test.org b/testing/examples/ob-C-test.org
index 0faf630b9..efae02a19 100644
--- a/testing/examples/ob-C-test.org
+++ b/testing/examples/ob-C-test.org
@@ -38,7 +38,7 @@
 #+end_src
 
 #+source: string_var
-#+begin_src cpp :var q="word" :includes '(<iostream> <cstring>) :results silent
+#+begin_src cpp :var q="word" :includes '("<iostream>" "<cstring>") :results silent
   std::cout << q << ' ' << std::strlen(q);
   return 0;
 #+end_src