diff --git a/internal/core/src/common/Types.h b/internal/core/src/common/Types.h
index 7c7bad44cb..a6fe0c9f50 100644
--- a/internal/core/src/common/Types.h
+++ b/internal/core/src/common/Types.h
@@ -580,7 +580,7 @@ FromValCase(milvus::proto::plan::GenericValue::ValCase val_case) {
         case milvus::proto::plan::GenericValue::ValCase::kFloatVal:
             return DataType::DOUBLE;
         case milvus::proto::plan::GenericValue::ValCase::kStringVal:
-            return DataType::STRING;
+            return DataType::VARCHAR;
         case milvus::proto::plan::GenericValue::ValCase::kArrayVal:
             return DataType::ARRAY;
         default: