diff --git a/exp_groups/controller.ts b/exp_groups/controller.ts
index 6f94b2c0..14d13ef2 100644
--- a/exp_groups/controller.ts
+++ b/exp_groups/controller.ts
@@ -191,8 +191,8 @@ export class ControllerPlugin extends BaseControllerPlugin {
 
     async handleResolvedAssignmentSubscription(request: lib.SubscriptionRequest) {
         // Check for any missing assignments to be computed on demand
-        const filters = Array.isArray(request.filters) ? request.filters : [request.filters!];
-        if (request.filters && filters.length) {
+        const filters = request.filters.toJSON();
+        if (filters.length) {
             const missing = filters.filter(name => !this.resolvedAssignments.has(name));
             if (missing.length) {
                 this.resolvedAssignments.setMany(await this.computeResolvedAssignments(missing));
diff --git a/exp_groups/instance.ts b/exp_groups/instance.ts
index 2421a92c..d3ed3cc4 100644
--- a/exp_groups/instance.ts
+++ b/exp_groups/instance.ts
@@ -45,7 +45,7 @@ export class InstancePlugin extends BaseInstancePlugin {
     async onStart() {
         // We use Date.now() because we need to manually initialise the groups on the lua side
         await this.instance.sendTo("controller", new lib.SubscriptionRequest(
-            `exp_groups:${messages.GroupUpdatedEvent.name}`, true, Date.now()
+            `exp_groups:${messages.GroupUpdatedEvent.name}`, "subscribe", Date.now()
         ));
         const groups = await this.instance.sendTo("controller", new messages.GroupListRequest())
         await this.luaSendInitialGroups(groups);
@@ -118,13 +118,13 @@ export class InstancePlugin extends BaseInstancePlugin {
 
     async subscribePlayerAssignment(playerName: string) {
         await this.instance.sendTo("controller", new lib.SubscriptionRequest(
-            `exp_groups:${messages.ResolvedAssignmentUpdatedEvent.name}`, true, 0, playerName
+            `exp_groups:${messages.ResolvedAssignmentUpdatedEvent.name}`, "subscribe", 0, lib.SubscriptionFilters.fromShorthand(playerName)
         ));
     }
 
     async unsubscribePlayerAssignment(playerName: string) {
         await this.instance.sendTo("controller", new lib.SubscriptionRequest(
-            `exp_groups:${messages.ResolvedAssignmentUpdatedEvent.name}`, false, 0, playerName
+            `exp_groups:${messages.ResolvedAssignmentUpdatedEvent.name}`, "unsubscribe", 0, lib.SubscriptionFilters.fromShorthand(playerName)
         ));
     }