diff --git a/hutool-json/src/main/java/org/dromara/hutool/json/JSON.java b/hutool-json/src/main/java/org/dromara/hutool/json/JSON.java
index 9cdb5cc7c..bc24f7d5f 100644
--- a/hutool-json/src/main/java/org/dromara/hutool/json/JSON.java
+++ b/hutool-json/src/main/java/org/dromara/hutool/json/JSON.java
@@ -146,9 +146,7 @@ public interface JSON extends Converter, Cloneable, Serializable {
 	 */
 	default String toJSONString(final int indentFactor) throws JSONException {
 		final StringWriter sw = new StringWriter();
-		synchronized (sw.getBuffer()) {
-			return this.write(sw, indentFactor, 0, null).toString();
-		}
+		return this.write(sw, indentFactor, 0, null).toString();
 	}
 
 	/**