diff --git a/be/src/vec/functions/function_json.cpp b/be/src/vec/functions/function_json.cpp
index cc6b22c7b5..4418561d88 100644
--- a/be/src/vec/functions/function_json.cpp
+++ b/be/src/vec/functions/function_json.cpp
@@ -41,6 +41,7 @@
 #include "common/compiler_util.h" // IWYU pragma: keep
 #include "common/status.h"
 #include "exprs/json_functions.h"
+#include "vec/io/io_helper.h"
 #ifdef __AVX2__
 #include "util/jsonb_parser_simd.h"
 #else
@@ -516,7 +517,7 @@ struct GetJsonString {
         rapidjson::Value* root = nullptr;
 
         root = get_json_object<JSON_FUN_STRING>(json_string, path_string, &document);
-        const int max_string_len = 65535;
+        const int max_string_len = DEFAULT_MAX_JSON_SIZE;
 
         if (root == nullptr || root->IsNull()) {
             StringOP::push_null_string(index_now, res_data, res_offsets, null_map);