diff --git a/spec/unit/pushprocessor.spec.js b/spec/unit/pushprocessor.spec.js
index 85fadcf78c1..df7666d5cd3 100644
--- a/spec/unit/pushprocessor.spec.js
+++ b/spec/unit/pushprocessor.spec.js
@@ -1,5 +1,6 @@
 import * as utils from "../test-utils/test-utils";
 import { PushProcessor } from "../../src/pushprocessor";
+import { EventType } from "../../src";
 
 describe('NotificationService', function() {
     const testUserId = "@ali:matrix.org";
@@ -208,6 +209,7 @@ describe('NotificationService', function() {
                 msgtype: "m.text",
             },
         });
+        matrixClient.pushRules = PushProcessor.rewriteDefaultRules(matrixClient.pushRules);
         pushProcessor = new PushProcessor(matrixClient);
     });
 
@@ -295,6 +297,21 @@ describe('NotificationService', function() {
         expect(actions.tweaks.highlight).toEqual(false);
     });
 
+    it('should not bing on room server ACL changes', function() {
+        testEvent = utils.mkEvent({
+            type: EventType.RoomServerAcl,
+            room: testRoomId,
+            user: "@alfred:localhost",
+            event: true,
+            content: {},
+        });
+
+        const actions = pushProcessor.actionsForEvent(testEvent);
+        expect(actions.tweaks.highlight).toBeFalsy();
+        expect(actions.tweaks.sound).toBeFalsy();
+        expect(actions.notify).toBeFalsy();
+    });
+
     // invalid
 
     it('should gracefully handle bad input.', function() {
diff --git a/src/pushprocessor.ts b/src/pushprocessor.ts
index ae170751f00..86462b4af43 100644
--- a/src/pushprocessor.ts
+++ b/src/pushprocessor.ts
@@ -34,6 +34,7 @@ import {
     PushRuleSet,
     TweakName,
 } from "./@types/PushRules";
+import { EventType } from "./@types/event";
 
 /**
  * @module pushprocessor
@@ -96,6 +97,22 @@ const DEFAULT_OVERRIDE_RULES: IPushRule[] = [
             PushRuleActionName.DontNotify,
         ],
     },
+    {
+        // For homeservers which don't support MSC3786 yet
+        rule_id: ".org.matrix.msc3786.rule.room.server_acl",
+        default: true,
+        enabled: true,
+        conditions: [
+            {
+                kind: ConditionKind.EventMatch,
+                key: "type",
+                pattern: EventType.RoomServerAcl,
+            },
+        ],
+        actions: [
+            PushRuleActionName.DontNotify,
+        ],
+    },
 ];
 
 export interface IActionsObject {