diff --git a/apm-sniffer/apm-sdk-plugin/mongodb-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/mongodb/v3/support/MongoOperationHelper.java b/apm-sniffer/apm-sdk-plugin/mongodb-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/mongodb/v3/support/MongoOperationHelper.java
index 71c2eb876..42e5ecdad 100644
--- a/apm-sniffer/apm-sdk-plugin/mongodb-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/mongodb/v3/support/MongoOperationHelper.java
+++ b/apm-sniffer/apm-sdk-plugin/mongodb-3.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/mongodb/v3/support/MongoOperationHelper.java
@@ -128,8 +128,7 @@ public class MongoOperationHelper {
             }
             final int filterLengthLimit = Config.Plugin.MongoDB.FILTER_LENGTH_LIMIT;
             if (filterLengthLimit > 0 && params.length() > filterLengthLimit) {
-                params.append("...");
-                break;
+                return params.substring(0, filterLengthLimit) + "...";
             }
         }
         return params.toString();