diff --git a/programs/mutant-5/swen90006/passbook/PassBook.java b/programs/mutant-5/swen90006/passbook/PassBook.java
index 0e300c9b917a339b5915e50edf22c2761f85cc2e..65b8ceca54cefd4d320a46ab8abb48b1dd24af23 100644
--- a/programs/mutant-5/swen90006/passbook/PassBook.java
+++ b/programs/mutant-5/swen90006/passbook/PassBook.java
@@ -94,10 +94,10 @@ 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') {
+		else if ('A' <= passphrase.charAt(i) || passphrase.charAt(i) <= 'Z') {
 		    containsUpperCase = true;
 		}
 		else if ('0' <= passphrase.charAt(i) && passphrase.charAt(i) <= '9') {