diff -dur boost.old/property_tree/detail/json_parser_write.hpp boost.new/property_tree/detail/json_parser_write.hpp
--- boost.old/property_tree/detail/json_parser_write.hpp	2012-07-26 19:42:10.000000000 -0700
+++ boost.new/property_tree/detail/json_parser_write.hpp	2012-07-26 19:43:34.000000000 -0700
@@ -93,7 +93,8 @@
                     stream << Ch(',');
                 if (pretty) stream << Ch('\n');
             }
-            stream << Str(4 * indent, Ch(' ')) << Ch(']');
+            if (pretty) stream << Str(4 * indent, Ch(' '));
+            stream << Ch(']');
 
         }
         else