diff --git a/include/fc/io/sstream.hpp b/include/fc/io/sstream.hpp
index 9010bfe..285c481 100644
--- a/include/fc/io/sstream.hpp
+++ b/include/fc/io/sstream.hpp
@@ -27,7 +27,7 @@ namespace fc {
 
     private:
       class impl;
-      fwd<impl,368> my;
+      fwd<impl, 392> my;
   };
 
 }