diff --git a/xo-reader/include/xo/reader/sequence_xs.hpp b/xo-reader/include/xo/reader/sequence_xs.hpp
index fa648c95..cad81cf2 100644
--- a/xo-reader/include/xo/reader/sequence_xs.hpp
+++ b/xo-reader/include/xo/reader/sequence_xs.hpp
@@ -33,6 +33,7 @@ namespace xo {
                                              parserstatemachine * p_psm) override;
 
             virtual void print(std::ostream & os) const override;
+            virtual bool pretty_print(const xo::print::ppindentinfo & ppii) const override;
 
         private:
             sequence_xs();
diff --git a/xo-reader/src/reader/sequence_xs.cpp b/xo-reader/src/reader/sequence_xs.cpp
index aa41c387..a7695673 100644
--- a/xo-reader/src/reader/sequence_xs.cpp
+++ b/xo-reader/src/reader/sequence_xs.cpp
@@ -119,6 +119,13 @@ namespace xo {
             os << "<sequence_xs" << xtag("expr_v.size", expr_v_.size()) << ">";
         }
 
+        bool
+        sequence_xs::pretty_print(const xo::print::ppindentinfo & ppii) const
+        {
+            return ppii.pps()->pretty_struct(ppii, "sequence_xs",
+                                             xrefrtag("expr_v.size", expr_v_.size()));
+        }
+
     } /*namespace scm*/
 } /*namespace xo*/