diff --git a/homeassistant/components/manual/alarm_control_panel.py b/homeassistant/components/manual/alarm_control_panel.py
index d35f9b73ef3..f0436ba1d69 100644
--- a/homeassistant/components/manual/alarm_control_panel.py
+++ b/homeassistant/components/manual/alarm_control_panel.py
@@ -1,7 +1,6 @@
 """Support for manual alarms."""
 from __future__ import annotations
 
-import copy
 import datetime
 import logging
 import re
@@ -74,15 +73,16 @@ ATTR_NEXT_STATE = "next_state"
 
 def _state_validator(config):
     """Validate the state."""
-    config = copy.deepcopy(config)
     for state in SUPPORTED_PRETRIGGER_STATES:
         if CONF_DELAY_TIME not in config[state]:
-            config[state][CONF_DELAY_TIME] = config[CONF_DELAY_TIME]
+            config[state] = config[state] | {CONF_DELAY_TIME: config[CONF_DELAY_TIME]}
         if CONF_TRIGGER_TIME not in config[state]:
-            config[state][CONF_TRIGGER_TIME] = config[CONF_TRIGGER_TIME]
+            config[state] = config[state] | {
+                CONF_TRIGGER_TIME: config[CONF_TRIGGER_TIME]
+            }
     for state in SUPPORTED_ARMING_STATES:
         if CONF_ARMING_TIME not in config[state]:
-            config[state][CONF_ARMING_TIME] = config[CONF_ARMING_TIME]
+            config[state] = config[state] | {CONF_ARMING_TIME: config[CONF_ARMING_TIME]}
 
     return config