diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 2a95d3ec07cd9..3c8f5faf6f89e 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -402,6 +402,13 @@ public class CarrierConfigManager {
     public static final String KEY_ALWAYS_SHOW_EMERGENCY_ALERT_ONOFF_BOOL =
             "always_show_emergency_alert_onoff_bool";
 
+    /**
+     * The flag to disable cell broadcast severe alert when extreme alert is disabled.
+     * @hide
+     */
+    public static final String KEY_DISABLE_SEVERE_WHEN_EXTREME_DISABLED_BOOL =
+            "disable_severe_when_extreme_disabled_bool";
+
     /**
      * The data call APN retry configuration for default type APN.
      * @hide
@@ -924,6 +931,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_ALLOW_ADDING_APNS_BOOL, true);
         sDefaults.putBoolean(KEY_BROADCAST_EMERGENCY_CALL_STATE_CHANGES_BOOL, false);
         sDefaults.putBoolean(KEY_ALWAYS_SHOW_EMERGENCY_ALERT_ONOFF_BOOL, false);
+        sDefaults.putBoolean(KEY_DISABLE_SEVERE_WHEN_EXTREME_DISABLED_BOOL, true);
         sDefaults.putString(KEY_CARRIER_DATA_CALL_RETRY_CONFIG_DEFAULT_STRING,
                 "default_randomization=2000,5000,10000,20000,40000,80000:5000,160000:5000,"
                         + "320000:5000,640000:5000,1280000:5000,1800000:5000");