diff --git a/src/com/android/settings/notification/AppNotificationSettings.java b/src/com/android/settings/notification/AppNotificationSettings.java
index e7be62f996a..4cbe6926341 100644
--- a/src/com/android/settings/notification/AppNotificationSettings.java
+++ b/src/com/android/settings/notification/AppNotificationSettings.java
@@ -201,7 +201,8 @@ public class AppNotificationSettings extends NotificationSettingsBase {
             final NotificationChannel channel) {
         MasterSwitchPreference channelPref = new MasterSwitchPreference(
                 getPrefContext());
-        channelPref.setSwitchEnabled(mSuspendedAppsAdmin == null && !mAppRow.systemApp);
+        channelPref.setSwitchEnabled(mSuspendedAppsAdmin == null
+                &&  isChannelBlockable(mAppRow.systemApp, channel));
         channelPref.setKey(channel.getId());
         channelPref.setTitle(channel.getName());
         channelPref.setChecked(channel.getImportance() != IMPORTANCE_NONE);
diff --git a/src/com/android/settings/notification/ChannelNotificationSettings.java b/src/com/android/settings/notification/ChannelNotificationSettings.java
index f7bf1ca702e..6b4129cdd27 100644
--- a/src/com/android/settings/notification/ChannelNotificationSettings.java
+++ b/src/com/android/settings/notification/ChannelNotificationSettings.java
@@ -228,7 +228,7 @@ public class ChannelNotificationSettings extends NotificationSettingsBase {
         mBlockBar.setKey(KEY_BLOCK);
         getPreferenceScreen().addPreference(mBlockBar);
 
-        if (mAppRow.systemApp && mChannel.getImportance() != NotificationManager.IMPORTANCE_NONE) {
+        if (!isChannelBlockable(mAppRow.systemApp, mChannel)) {
             setVisible(mBlockBar, false);
         }
 
diff --git a/src/com/android/settings/notification/NotificationSettingsBase.java b/src/com/android/settings/notification/NotificationSettingsBase.java
index e055133f34e..fe426e7833b 100644
--- a/src/com/android/settings/notification/NotificationSettingsBase.java
+++ b/src/com/android/settings/notification/NotificationSettingsBase.java
@@ -443,4 +443,12 @@ abstract public class NotificationSettingsBase extends SettingsPreferenceFragmen
 
         return lockscreenSecure;
     }
+
+    protected boolean isChannelBlockable(boolean systemApp, NotificationChannel channel) {
+        if (!mAppRow.systemApp) {
+            return true;
+        }
+        return channel.isBlockableSystem()
+                || channel.getImportance() == NotificationManager.IMPORTANCE_NONE;
+    }
 }