diff --git a/src/com/android/settings/notification/app/BlockPreferenceController.java b/src/com/android/settings/notification/app/BlockPreferenceController.java
index 589a03db614..e5a7e980c5f 100644
--- a/src/com/android/settings/notification/app/BlockPreferenceController.java
+++ b/src/com/android/settings/notification/app/BlockPreferenceController.java
@@ -16,6 +16,7 @@
 
 package com.android.settings.notification.app;
 
+import static android.app.NotificationManager.IMPORTANCE_LOW;
 import static android.app.NotificationManager.IMPORTANCE_NONE;
 import static android.app.NotificationManager.IMPORTANCE_UNSPECIFIED;
 
@@ -107,7 +108,7 @@ public class BlockPreferenceController extends NotificationPreferenceController
                         ? IMPORTANCE_NONE
                         : isDefaultChannel()
                                 ? IMPORTANCE_UNSPECIFIED
-                                : mChannel.getOriginalImportance();
+                                : Math.max(mChannel.getOriginalImportance(), IMPORTANCE_LOW);
                 mChannel.setImportance(importance);
                 saveChannel();
             }
diff --git a/src/com/android/settings/notification/app/ChannelListPreferenceController.java b/src/com/android/settings/notification/app/ChannelListPreferenceController.java
index 8410ce13a4c..5fd607f0adf 100644
--- a/src/com/android/settings/notification/app/ChannelListPreferenceController.java
+++ b/src/com/android/settings/notification/app/ChannelListPreferenceController.java
@@ -339,7 +339,9 @@ public class ChannelListPreferenceController extends NotificationPreferenceContr
         channelPref.setOnPreferenceChangeListener(
                 (preference, o) -> {
                     boolean value = (Boolean) o;
-                    int importance = value ? channel.getOriginalImportance() : IMPORTANCE_NONE;
+                    int importance = value
+                            ? Math.max(channel.getOriginalImportance(), IMPORTANCE_LOW)
+                            : IMPORTANCE_NONE;
                     channel.setImportance(importance);
                     channel.lockFields(NotificationChannel.USER_LOCKED_IMPORTANCE);
                     PrimarySwitchPreference channelPref1 = (PrimarySwitchPreference) preference;