diff --git a/lineage/res/res/values/config.xml b/lineage/res/res/values/config.xml
index e43f83b0..a902ce5f 100644
--- a/lineage/res/res/values/config.xml
+++ b/lineage/res/res/values/config.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
      Copyright (C) 2015 The CyanogenMod Project
-                   2017-2020 The LineageOS Project
+                   2017-2021 The LineageOS Project
 
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
@@ -151,6 +151,22 @@
          config to 7. -->
     <integer name="config_deviceHardwareWakeKeys">64</integer>
 
+    <!-- Control the behavior when the user long presses the back button.
+            0 - Nothing
+            1 - Menu key
+            2 - Recent apps view in SystemUI
+            3 - Launch assist intent
+            4 - Voice Search
+            5 - In-app Search
+            6 - Launch camera
+            7 - Sleep
+            8 - Last app
+            9 - Toggle split screen
+         This needs to match the enums in
+         sdk/src/java/org/lineageos/internal/util/DeviceKeysConstants.java.
+    -->
+    <integer name="config_longPressOnBackBehavior">0</integer>
+
     <!-- Control the behavior when the user long presses the home button.
             0 - Nothing
             1 - Menu key
diff --git a/lineage/res/res/values/symbols.xml b/lineage/res/res/values/symbols.xml
index c3a7d85a..eb5d3387 100644
--- a/lineage/res/res/values/symbols.xml
+++ b/lineage/res/res/values/symbols.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
      Copyright (C) 2015 The CyanogenMod Project
-                   2017-2018 The LineageOS Project
+                   2017-2021 The LineageOS Project
 
      Licensed under the Apache License, Version 2.0 (the "License");
      you may not use this file except in compliance with the License.
@@ -104,6 +104,7 @@
     <java-symbol type="integer" name="config_deviceHardwareWakeKeys" />
 
     <!-- Device keys user-customisable behavior -->
+    <java-symbol type="integer" name="config_longPressOnBackBehavior" />
     <java-symbol type="integer" name="config_longPressOnHomeBehavior" />
     <java-symbol type="integer" name="config_doubleTapOnHomeBehavior" />
     <java-symbol type="integer" name="config_longPressOnMenuBehavior" />
diff --git a/sdk/src/java/lineageos/providers/LineageSettings.java b/sdk/src/java/lineageos/providers/LineageSettings.java
index e98795fa..4d5a3416 100644
--- a/sdk/src/java/lineageos/providers/LineageSettings.java
+++ b/sdk/src/java/lineageos/providers/LineageSettings.java
@@ -1076,6 +1076,17 @@ public final class LineageSettings {
         public static final Validator KEY_HOME_DOUBLE_TAP_ACTION_VALIDATOR =
                 new InclusiveIntegerRangeValidator(0, 9);
 
+        /**
+         * Action to perform when the back key is long-pressed.
+         * (Default can be configured via config_longPressOnBackBehavior)
+         * (See KEY_HOME_LONG_PRESS_ACTION for valid values)
+         */
+        public static final String KEY_BACK_LONG_PRESS_ACTION = "key_back_long_press_action";
+
+        /** @hide */
+        public static final Validator KEY_BACK_LONG_PRESS_ACTION_VALIDATOR =
+                new InclusiveIntegerRangeValidator(0, 9);
+
         /**
          * Whether to wake the screen with the back key, the value is boolean.
          * 0 = 0ff, 1 = on
@@ -2149,6 +2160,7 @@ public final class LineageSettings {
          */
         public static final String[] LEGACY_SYSTEM_SETTINGS = new String[]{
                 LineageSettings.System.NAV_BUTTONS,
+                LineageSettings.System.KEY_BACK_LONG_PRESS_ACTION,
                 LineageSettings.System.KEY_HOME_LONG_PRESS_ACTION,
                 LineageSettings.System.KEY_HOME_DOUBLE_TAP_ACTION,
                 LineageSettings.System.BACK_WAKE_SCREEN,
@@ -2277,6 +2289,7 @@ public final class LineageSettings {
             VALIDATORS.put(NAVIGATION_BAR_MENU_ARROW_KEYS,
                     NAVIGATION_BAR_MENU_ARROW_KEYS_VALIDATOR);
             VALIDATORS.put(NAVIGATION_BAR_HINT, NAVIGATION_BAR_HINT_VALIDATOR);
+            VALIDATORS.put(KEY_BACK_LONG_PRESS_ACTION, KEY_BACK_LONG_PRESS_ACTION_VALIDATOR);
             VALIDATORS.put(KEY_HOME_LONG_PRESS_ACTION, KEY_HOME_LONG_PRESS_ACTION_VALIDATOR);
             VALIDATORS.put(KEY_HOME_DOUBLE_TAP_ACTION, KEY_HOME_DOUBLE_TAP_ACTION_VALIDATOR);
             VALIDATORS.put(BACK_WAKE_SCREEN, BACK_WAKE_SCREEN_VALIDATOR);