diff --git a/integtest/change_rate_test.py b/integtest/change_rate_test.py
index 314f055d..233a2dbc 100644
--- a/integtest/change_rate_test.py
+++ b/integtest/change_rate_test.py
@@ -82,28 +82,14 @@
 conf_dict.op_env = "integtest"
 conf_dict.config_session_name = "changerate"
 conf_dict.tpg_enabled = False
+utility_functions.set_rtcm_trigger_params(conf_dict, trigger_rate=1.0,
+                                          readout_window_before_ticks=readout_window_time_before,
+                                          readout_window_after_ticks=readout_window_time_after)
 
 conf_dict.config_substitutions.append(
     data_classes.attribute_substitution(obj_class="LatencyBuffer", updates={"size": 50000})
 )
 
-conf_dict.config_substitutions.append(
-    data_classes.attribute_substitution(
-        obj_class="RandomTCMakerConf",
-        updates={"trigger_rate_hz": 1.0},
-    )
-)
-
-conf_dict.config_substitutions.append(
-    data_classes.attribute_substitution(
-        obj_class="TCReadoutMap",
-        updates={
-            "time_before": readout_window_time_before,
-            "time_after": readout_window_time_after,
-        },
-    )
-)
-
 confgen_arguments = {"MinimalSystem": conf_dict}
 # The commands to run in dunerc, as a list
 dunerc_command_list = (