diff --git a/plugin/trino-postgresql/src/test/java/io/trino/plugin/postgresql/TestPostgreSqlConnectorTest.java b/plugin/trino-postgresql/src/test/java/io/trino/plugin/postgresql/TestPostgreSqlConnectorTest.java
index faed2af541181..8f75cef396e5c 100644
--- a/plugin/trino-postgresql/src/test/java/io/trino/plugin/postgresql/TestPostgreSqlConnectorTest.java
+++ b/plugin/trino-postgresql/src/test/java/io/trino/plugin/postgresql/TestPostgreSqlConnectorTest.java
@@ -103,6 +103,7 @@ protected QueryRunner createQueryRunner()
         postgreSqlServer = closeAfterClass(new TestingPostgreSqlServer());
         return PostgreSqlQueryRunner.builder(postgreSqlServer)
                 .setInitialTables(REQUIRED_TPCH_TABLES)
+                .withProtocolSpooling("json")
                 .build();
     }