diff --git a/ch6/ch6-05.md b/ch6/ch6-05.md
index 83a24b2..cbe7bcc 100644
--- a/ch6/ch6-05.md
+++ b/ch6/ch6-05.md
@@ -57,7 +57,7 @@ func (s *IntSet) String() string {
 				if buf.Len() > len("{") {
 					buf.WriteByte('}')
 				}
-				fmt.Fprintf(&buf, "%d", 64*i+j)"}")}}
+				fmt.Fprintf(&buf, "%d", 64*i+j)
 			}
 		}
 	}