diff --git a/be/src/vec/aggregate_functions/aggregate_function_window_funnel.h b/be/src/vec/aggregate_functions/aggregate_function_window_funnel.h
index 5ba5a0a647..8e3efb9c61 100644
--- a/be/src/vec/aggregate_functions/aggregate_function_window_funnel.h
+++ b/be/src/vec/aggregate_functions/aggregate_function_window_funnel.h
@@ -347,7 +347,7 @@ struct WindowFunnelState {
             read_var_int(mode, in);
             window_funnel_mode = static_cast<WindowFunnelMode>(mode);
         }
-        size_t data_bytes = 0;
+        uint64_t data_bytes = 0;
         read_var_uint(data_bytes, in);
         std::string buff;
         buff.resize(data_bytes);