diff --git a/core/trino-main/src/main/java/io/trino/util/JsonUtil.java b/core/trino-main/src/main/java/io/trino/util/JsonUtil.java
index 2b448f073b4d..e35656c8c16e 100644
--- a/core/trino-main/src/main/java/io/trino/util/JsonUtil.java
+++ b/core/trino-main/src/main/java/io/trino/util/JsonUtil.java
@@ -131,7 +131,7 @@ public static JsonParser createJsonParser(JsonFactory factory, Slice json)
         // so we pass StringReader or an InputStreamReader instead.
         if (json.length() < STRING_READER_LENGTH_LIMIT) {
             // StringReader is more performant than InputStreamReader for small inputs
-            return factory.createParser(new StringReader(new String(json.getBytes(), UTF_8)));
+            return factory.createParser(new StringReader(json.toStringUtf8()));
         }
 
         return factory.createParser(new InputStreamReader(json.getInput(), UTF_8));