diff --git a/include/fc/config.hpp b/include/fc/config.hpp
index 08aa31a..8e64a1d 100644
--- a/include/fc/config.hpp
+++ b/include/fc/config.hpp
@@ -3,6 +3,11 @@
   #define FC_PACK_MAX_DEPTH 1000
 #endif
 
+#ifndef FC_MAX_STRING_OBJECT_DEPTH
+  // how many levels of nested objects are proceed for string functions
+#define FC_MAX_STRING_OBJECT_DEPTH 200
+#endif
+
 #ifndef FC_MAX_LOG_OBJECT_DEPTH
    // how many levels of nested objects are displayed in log messages
    #define FC_MAX_LOG_OBJECT_DEPTH 1000
diff --git a/include/fc/string.hpp b/include/fc/string.hpp
index 13e10da..2fce7b0 100755
--- a/include/fc/string.hpp
+++ b/include/fc/string.hpp
@@ -2,6 +2,7 @@
 #include <fc/utility.hpp>
 #include <fc/fwd.hpp>
 #include <fc/optional.hpp>
+#include <fc/config.hpp>
 
 #ifndef USE_FC_STRING
 #include <string>
@@ -25,7 +26,7 @@ namespace fc
 
   typedef fc::optional<fc::string> ostring;
   class variant_object;
-  fc::string format_string( const fc::string&, const variant_object&, uint32_t max_object_depth = 200 );
+  fc::string format_string( const fc::string&, const variant_object&, uint32_t max_object_depth = FC_MAX_STRING_OBJECT_DEPTH );
   fc::string trim( const fc::string& );
   fc::string to_lower( const fc::string& );
   string trim_and_normalize_spaces( const string& s );