diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a37fc6b..9bad60a8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@ Many thanks to the following for contributing to this release:
 - Added `host.factorio_username` and `host.factorio_token` config to set Factorio credentials used on a given host.
 - Fixed 2.0 version extraction from linux headless downloaded during installation of clusterio. [#671](https://github.com/clusterio/clusterio/pull/671)
 - Updated display name and description of `controller.external_address` to avoid confusion. [#674](https://github.com/clusterio/clusterio/pull/674)
+- Fixed host user sync to instances after reconnecting to the controller. [#678](https://github.com/clusterio/clusterio/pull/678)
 
 ### Breaking Changes
 
diff --git a/packages/lib/src/data/messages_instance.ts b/packages/lib/src/data/messages_instance.ts
index 13d80966..26ec89a5 100644
--- a/packages/lib/src/data/messages_instance.ts
+++ b/packages/lib/src/data/messages_instance.ts
@@ -864,7 +864,7 @@ export class InstanceDetailsChangedEvent {
 export class InstanceBanlistUpdateEvent {
 	declare ["constructor"]: typeof InstanceBanlistUpdateEvent;
 	static type = "event" as const;
-	static src = "controller" as const;
+	static src = ["controller", "host"] as const;
 	static dst = "instance" as const;
 
 	constructor(
@@ -887,7 +887,7 @@ export class InstanceBanlistUpdateEvent {
 export class InstanceAdminlistUpdateEvent {
 	declare ["constructor"]: typeof InstanceAdminlistUpdateEvent;
 	static type = "event" as const;
-	static src = "controller" as const;
+	static src = ["controller", "host"] as const;
 	static dst = "instance" as const;
 
 	constructor(
@@ -908,7 +908,7 @@ export class InstanceAdminlistUpdateEvent {
 export class InstanceWhitelistUpdateEvent {
 	declare ["constructor"]: typeof InstanceWhitelistUpdateEvent;
 	static type = "event" as const;
-	static src = "controller" as const;
+	static src = ["controller", "host"] as const;
 	static dst = "instance" as const;
 
 	constructor(
diff --git a/test/host.js b/test/host.js
index 75244b9e..f5189d0d 100644
--- a/test/host.js
+++ b/test/host.js
@@ -4,6 +4,7 @@ const path = require("path");
 
 const lib = require("@clusterio/lib");
 const Host = require("@clusterio/host/dist/node/src/Host").default;
+const Instance = require("@clusterio/host/dist/node/src/Instance").default;
 const { _discoverInstances } = require("@clusterio/host/dist/node/src/Host");
 
 describe("Host testing", function() {
@@ -28,7 +29,15 @@ describe("Host testing", function() {
 
 	describe("class Host", function() {
 		describe(".handleSyncUserListsEvent()", function() {
-			let mockHost;
+			const hostAddress = lib.Address.fromShorthand({ hostId: 1 });
+			const instanceAddress = lib.Address.fromShorthand({ instanceId: 1 });
+			let mockHost, hostConnector, instanceConnector;
+			before(function() {
+				[hostConnector, instanceConnector] = lib.VirtualConnector.makePair(hostAddress, instanceAddress);
+				instanceConnector.on("message", function(message) {
+					Instance.prototype._validateMessage(message);
+				});
+			});
 			beforeEach(function() {
 				mockHost = {
 					adminlist: new Set(),
@@ -37,6 +46,7 @@ describe("Host testing", function() {
 					broadcasts: [],
 					broadcastEventToInstance(event) {
 						this.broadcasts.push(event);
+						hostConnector.sendEvent(event, instanceAddress);
 					},
 					handleSyncUserListsEvent: Host.prototype.handleSyncUserListsEvent,
 					syncLists(adminlist, banlist, whitelist) {