diff --git a/sdk-core/src/main/java/io/milvus/v2/utils/VectorUtils.java b/sdk-core/src/main/java/io/milvus/v2/utils/VectorUtils.java
index 327759019..d17381063 100644
--- a/sdk-core/src/main/java/io/milvus/v2/utils/VectorUtils.java
+++ b/sdk-core/src/main/java/io/milvus/v2/utils/VectorUtils.java
@@ -378,7 +378,7 @@ public static SearchRequest convertAnnSearchParam(@NonNull AnnSearchReq annSearc
             data.add(vector.getData());
         }
 
-        ByteString byteStr = ParamUtils.convertPlaceholder(data, plType);
+        ByteString byteStr = convertPlaceholder(data, plType);
         builder.setPlaceholderGroup(byteStr);
         builder.setNq(vectors.size());