diff --git a/services/core/java/com/android/server/notification/ZenModeHelper.java b/services/core/java/com/android/server/notification/ZenModeHelper.java
index 93f1b4741bd6c..9e0c97502c4fb 100644
--- a/services/core/java/com/android/server/notification/ZenModeHelper.java
+++ b/services/core/java/com/android/server/notification/ZenModeHelper.java
@@ -104,6 +104,7 @@ public class ZenModeHelper {
 
     // The amount of time rules instances can exist without their owning app being installed.
     private static final int RULE_INSTANCE_GRACE_PERIOD = 1000 * 60 * 60 * 72;
+    static final int RULE_LIMIT_PER_PACKAGE = 100;
 
     // pkg|userId => uid
     protected final ArrayMap<String, Integer> mRulesUidCache = new ArrayMap<>();
@@ -329,10 +330,10 @@ public class ZenModeHelper {
             int newRuleInstanceCount = getCurrentInstanceCount(automaticZenRule.getOwner())
                     + getCurrentInstanceCount(automaticZenRule.getConfigurationActivity())
                     + 1;
-            if (ruleInstanceLimit > 0 && ruleInstanceLimit < newRuleInstanceCount) {
+            if (newRuleInstanceCount > RULE_LIMIT_PER_PACKAGE
+                    || (ruleInstanceLimit > 0 && ruleInstanceLimit < newRuleInstanceCount)) {
                 throw new IllegalArgumentException("Rule instance limit exceeded");
             }
-
         }
 
         ZenModeConfig newConfig;
diff --git a/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java b/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
index 31be33e98363a..fd1536c5c0f10 100644
--- a/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
+++ b/services/tests/uiservicestests/src/com/android/server/notification/ZenModeHelperTest.java
@@ -43,6 +43,7 @@ import static com.android.os.AtomsProto.DNDModeProto.ENABLED_FIELD_NUMBER;
 import static com.android.os.AtomsProto.DNDModeProto.ID_FIELD_NUMBER;
 import static com.android.os.AtomsProto.DNDModeProto.UID_FIELD_NUMBER;
 import static com.android.os.AtomsProto.DNDModeProto.ZEN_MODE_FIELD_NUMBER;
+import static com.android.server.notification.ZenModeHelper.RULE_LIMIT_PER_PACKAGE;
 
 import static junit.framework.Assert.assertEquals;
 import static junit.framework.Assert.assertFalse;
@@ -1610,6 +1611,35 @@ public class ZenModeHelperTest extends UiServiceTestCase {
         assertFalse(Objects.equals(defaultRuleName, ruleAfterUpdating.name)); // update name
     }
 
+    @Test
+    public void testAddAutomaticZenRule_beyondSystemLimit() {
+        for (int i = 0; i < RULE_LIMIT_PER_PACKAGE; i++) {
+            ScheduleInfo si = new ScheduleInfo();
+            si.startHour = i;
+            AutomaticZenRule zenRule = new AutomaticZenRule("name" + i,
+                    null,
+                    new ComponentName("android", "ScheduleConditionProvider"),
+                    ZenModeConfig.toScheduleConditionId(si),
+                    new ZenPolicy.Builder().build(),
+                    NotificationManager.INTERRUPTION_FILTER_PRIORITY, true);
+            String id = mZenModeHelperSpy.addAutomaticZenRule("android", zenRule, "test");
+            assertNotNull(id);
+        }
+        try {
+            AutomaticZenRule zenRule = new AutomaticZenRule("name",
+                    null,
+                    new ComponentName("android", "ScheduleConditionProvider"),
+                    ZenModeConfig.toScheduleConditionId(new ScheduleInfo()),
+                    new ZenPolicy.Builder().build(),
+                    NotificationManager.INTERRUPTION_FILTER_PRIORITY, true);
+            String id = mZenModeHelperSpy.addAutomaticZenRule("android", zenRule, "test");
+            fail("allowed too many rules to be created");
+        } catch (IllegalArgumentException e) {
+            // yay
+        }
+
+    }
+
     @Test
     public void testAddAutomaticZenRule_CA() {
         AutomaticZenRule zenRule = new AutomaticZenRule("name",