diff --git a/lib/irb.rb b/lib/irb.rb
index 1fb178116..2926825ab 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -586,7 +586,7 @@ def convert_invalid_byte_sequence(str)
         ret = conv.primitive_convert(str, dst)
         case ret
         when :invalid_byte_sequence
-          conf.insert_output(conf.primitive_errinfo[3].dump[1..-2])
+          conv.insert_output(conf.primitive_errinfo[3].dump[1..-2])
           redo
         when :undefined_conversion
           c = conv.primitive_errinfo[3].dup.force_encoding(conv.primitive_errinfo[1])