diff --git a/hls4ml/writer/vivado_accelerator_writer.py b/hls4ml/writer/vivado_accelerator_writer.py
index cefa158e1..817847887 100644
--- a/hls4ml/writer/vivado_accelerator_writer.py
+++ b/hls4ml/writer/vivado_accelerator_writer.py
@@ -394,6 +394,8 @@ def write_board_script(self, model):
         f.write('set clock_uncertainty {}\n'.format(model.config.get_config_value('ClockUncertainty', '12.5%')))
         f.write('variable version\n')
         f.write('set version "{}"\n'.format(model.config.get_config_value('Version', '1.0.0')))
+        f.write('variable maximum_size\n')
+        f.write('set maximum_size {}\n'.format(model.config.get_config_value('MaximumSize', '4096')))
         if self.vivado_accelerator_config.get_interface() == 'axi_stream':
             in_bit, out_bit = self.vivado_accelerator_config.get_io_bitwidth()
             f.write(f'set bit_width_hls_output {in_bit}\n')