diff --git a/pulsar-broker/src/test/java/org/apache/pulsar/schema/SchemaTest.java b/pulsar-broker/src/test/java/org/apache/pulsar/schema/SchemaTest.java
index 5c8336116a593..3c6f7c73fbc9b 100644
--- a/pulsar-broker/src/test/java/org/apache/pulsar/schema/SchemaTest.java
+++ b/pulsar-broker/src/test/java/org/apache/pulsar/schema/SchemaTest.java
@@ -707,8 +707,7 @@ public void testNullKeyValueProperty() throws PulsarAdminException, PulsarClient
         map.put("key", null);
         map.put(null, "value"); // null key is not allowed for JSON, it's only for test here
 
-        // leave INT32 instance unchanged
-        final Schema<Integer> integerSchema = Schema.INT32.clone();
+        final Schema<Integer> integerSchema = Schema.JSON(Integer.class);
         ((SchemaInfoImpl) integerSchema.getSchemaInfo()).setProperties(map);
 
         final Consumer<Integer> consumer = pulsarClient.newConsumer(integerSchema).topic(topic)