diff --git a/include/chaiscript/language/chaiscript_eval.hpp b/include/chaiscript/language/chaiscript_eval.hpp
index 0df7bf2..b014e12 100644
--- a/include/chaiscript/language/chaiscript_eval.hpp
+++ b/include/chaiscript/language/chaiscript_eval.hpp
@@ -1014,6 +1014,10 @@ namespace chaiscript
 
         }
 
+        virtual std::string pretty_print() const
+        {
+          return "[" + AST_Node::pretty_print() + "]";
+        }
     };
 
     struct Inline_Map_AST_Node : public AST_Node {