diff --git a/tck/src/main/java/jakarta/json/bind/tck/defaultmapping/dates/DatesMappingTest.java b/tck/src/main/java/jakarta/json/bind/tck/defaultmapping/dates/DatesMappingTest.java
index a62ab372..4ac8f5b8 100644
--- a/tck/src/main/java/jakarta/json/bind/tck/defaultmapping/dates/DatesMappingTest.java
+++ b/tck/src/main/java/jakarta/json/bind/tck/defaultmapping/dates/DatesMappingTest.java
@@ -464,8 +464,8 @@ public void testZonedDateTimeMapping() {
    */
   @Test
   public void testZoneIdMapping() {
-    new MappingTester<>(ZoneIdContainer.class).test(ZoneId.of("UTC"),
-        "\"UTC\"");
+    new MappingTester<>(ZoneIdContainer.class).test(ZoneId.of("UTC").normalized(),
+        "\"Z\"");
   }
 
   /*