diff --git a/programs/mutant-3/swen90006/passbook/PassBook.java b/programs/mutant-3/swen90006/passbook/PassBook.java
index a794453e5602d4de02c96ce0c43c7f72e645960d..a3857278e1929dea13a12af96751bab256dd91e0 100644
--- a/programs/mutant-3/swen90006/passbook/PassBook.java
+++ b/programs/mutant-3/swen90006/passbook/PassBook.java
@@ -99,7 +99,7 @@ public class PassBook
 		else if ('A' <= passphrase.charAt(i) && passphrase.charAt(i) <= 'Z') {
 		    containsUpperCase = true;
 		}
-		else if ('0' <= passphrase.charAt(i) && passphrase.charAt(i) <= '9') {
+		else if ('0' <= passphrase.charAt(i) && passphrase.charAt(i) = '9') {
 		    containsNumber = true;
 		}
 	    }