diff --git a/support/3rd_party/include/utils/file.hpp b/support/3rd_party/include/utils/file.hpp
index 541cba16..6513d41e 100644
--- a/support/3rd_party/include/utils/file.hpp
+++ b/support/3rd_party/include/utils/file.hpp
@@ -77,8 +77,9 @@ public:
 #if defined(PROJECT_ENABLE_JSON)
   [[nodiscard]] auto write(const nlohmann::json &data, std::uint64_t offset,
                            std::size_t *total_written = nullptr) -> bool {
-    return write_(reinterpret_cast<const unsigned char *>(data.dump().c_str()),
-                  offset, total_written);
+    auto str_data = data.dump();
+    return write_(reinterpret_cast<const unsigned char *>(str_data.c_str()),
+                  data.size(), offset, total_written);
   }
 #endif // defined(PROJECT_ENABLE_JSON)