diff --git a/test/test_datac13_negative.py b/test/test_datac13_negative.py
index 49f907ef..6951d2a2 100644
--- a/test/test_datac13_negative.py
+++ b/test/test_datac13_negative.py
@@ -41,7 +41,7 @@ def parameters() -> dict:
     beacon_timeout = 1
     ping_timeout = 1
     connect_timeout = 2
-    stop_timeout = 2
+    stop_timeout = 4
 
     beacon_tx_check = '"status":"Failed"'
     ping_tx_check = '"ping","status":"Failed"'
diff --git a/test/util_datac13.py b/test/util_datac13.py
index 37f09de1..2c1d7368 100644
--- a/test/util_datac13.py
+++ b/test/util_datac13.py
@@ -74,7 +74,7 @@ def t_setup(
     tnc_data_handler.time_list = [3, 1, 1]
     # Limit number of retries
     tnc_data_handler.rx_n_max_retries_per_burst = 4
-    #ModemParam.tx_delay = 500 # add additional delay time for passing test
+    ModemParam.tx_delay = 500 # add additional delay time for passing test
 
 
     # Create the modem