diff --git a/src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipControllerRestTest.java b/src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipControllerRestTest.java
index 0d937904..39af92bc 100644
--- a/src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipControllerRestTest.java
+++ b/src/test/java/net/hostsharing/hsadminng/hs/office/membership/HsOfficeMembershipControllerRestTest.java
@@ -306,10 +306,10 @@ public class HsOfficeMembershipControllerRestTest {
 
         public enum InvalidMemberSuffixVariants {
             MISSING("", "[memberNumberSuffix must not be null but is \"null\"]"),
-            TOO_SMALL("\"memberNumberSuffix\": \"9\",", "memberNumberSuffix size must be between 2 and 2 but is \"9\""),
-            TOO_LARGE("\"memberNumberSuffix\": \"100\",", "memberNumberSuffix size must be between 2 and 2 but is \"100\""),
-            NOT_NUMERIC("\"memberNumberSuffix\": \"AA\",", "memberNumberSuffix must match \"[0-9]+\" but is \"AA\""),
-            EMPTY("\"memberNumberSuffix\": \"\",", "memberNumberSuffix size must be between 2 and 2 but is \"\"");
+            TOO_SMALL("\"memberNumberSuffix\": \"9\",", "memberNumberSuffix must match \"[0-9]{2}\" but is \"9\""),
+            TOO_LARGE("\"memberNumberSuffix\": \"100\",", "memberNumberSuffix must match \"[0-9]{2}\" but is \"100\""),
+            NOT_NUMERIC("\"memberNumberSuffix\": \"AA\",", "memberNumberSuffix must match \"[0-9]{2}\" but is \"AA\""),
+            EMPTY("\"memberNumberSuffix\": \"\",", "memberNumberSuffix must match \"[0-9]{2}\" but is \"\"");
 
             private final String memberNumberSuffixEntry;
             private final String expectedErrorMessage;