diff --git a/programs/mutant-5/swen90006/passbook/PassBook.java b/programs/mutant-5/swen90006/passbook/PassBook.java
index 3a33d41e67cc3b4f27f9117b085ece56f258d6a0..da6b60257816038614f88e19586604f65d6c55ab 100644
--- a/programs/mutant-5/swen90006/passbook/PassBook.java
+++ b/programs/mutant-5/swen90006/passbook/PassBook.java
@@ -96,7 +96,7 @@ public class PassBook
 	    boolean containsNumber = false;
 	    for (int i = 0; i < passphrase.length(); i++) {
 
-		if ('a' <= passphrase.charAt(i) && passphrase.charAt(i) <= 'z') {
+		if ('a' < passphrase.charAt(i) && passphrase.charAt(i) < 'z') {
 		    containsLowerCase = false;
 		}
 		else if ('A' <= passphrase.charAt(i) && passphrase.charAt(i) <= 'Z') {