diff --git a/source/chapter2/05_Control_Flow.md b/source/chapter2/05_Control_Flow.md
index 3a368de0..0788e176 100755
--- a/source/chapter2/05_Control_Flow.md
+++ b/source/chapter2/05_Control_Flow.md
@@ -550,7 +550,7 @@ case let (x, y):
 ```swift
 let puzzleInput = "great minds think alike"
 var puzzleOutput = ""
-for character in puzzleInput {
+for character in puzzleInput.characters {
     switch character {
     case "a", "e", "i", "o", "u", " ":
         continue