diff --git a/openfpga_flow/tasks/basic_tests/full_testbench/configuration_chain/config/task.conf b/openfpga_flow/tasks/basic_tests/full_testbench/configuration_chain/config/task.conf
index f11b117cd..1f818415a 100644
--- a/openfpga_flow/tasks/basic_tests/full_testbench/configuration_chain/config/task.conf
+++ b/openfpga_flow/tasks/basic_tests/full_testbench/configuration_chain/config/task.conf
@@ -20,6 +20,7 @@ openfpga_shell_template=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_shell_scrip
 openfpga_arch_file=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_arch/k4_N4_40nm_cc_openfpga.xml
 openfpga_sim_setting_file=${PATH:OPENFPGA_PATH}/openfpga_flow/openfpga_simulation_settings/auto_sim_openfpga.xml
 openfpga_vpr_device_layout=
+openfpga_fast_configuration=
 
 [ARCHITECTURES]
 arch0=${PATH:OPENFPGA_PATH}/openfpga_flow/vpr_arch/k4_N4_tileable_40nm.xml