diff --git a/extensions/arc/src/models/controllerModel.ts b/extensions/arc/src/models/controllerModel.ts
index a112446bf6..eedfed3fae 100644
--- a/extensions/arc/src/models/controllerModel.ts
+++ b/extensions/arc/src/models/controllerModel.ts
@@ -138,12 +138,19 @@ export class ControllerModel {
 		return this._controllerRegistration;
 	}
 
-	public getRegistration(type: string, namespace: string, name: string): Registration | undefined {
+	public getRegistration(type: ResourceType, namespace: string, name: string): Registration | undefined {
 		return this._registrations.find(r => {
 			return r.instanceType === type && r.instanceNamespace === namespace && parseInstanceName(r.instanceName) === name;
 		});
 	}
 
+	public async deleteRegistration(type: ResourceType, namespace: string, name: string) {
+		const r = this.getRegistration(type, namespace, name);
+		if (r && !r.isDeleted && r.customObjectName) {
+			await this._registrationRouter.apiV1RegistrationNsNameIsDeletedDelete(this._namespace, r.customObjectName, true);
+		}
+	}
+
 	/**
 	 * Deletes the specified MIAA resource from the controller
 	 * @param namespace The namespace of the resource
@@ -151,6 +158,7 @@ export class ControllerModel {
 	 */
 	public async miaaDelete(namespace: string, name: string): Promise<void> {
 		await this._sqlInstanceRouter.apiV1HybridSqlNsNameDelete(namespace, name);
+		await this.deleteRegistration(ResourceType.sqlManagedInstances, namespace, name);
 	}
 
 	/**
diff --git a/extensions/arc/src/ui/dashboards/postgres/postgresOverviewPage.ts b/extensions/arc/src/ui/dashboards/postgres/postgresOverviewPage.ts
index 5af2dc40f0..8ad035a15f 100644
--- a/extensions/arc/src/ui/dashboards/postgres/postgresOverviewPage.ts
+++ b/extensions/arc/src/ui/dashboards/postgres/postgresOverviewPage.ts
@@ -231,6 +231,7 @@ export class PostgresOverviewPage extends DashboardPage {
 				try {
 					if (await promptForResourceDeletion(this._postgresModel.namespace, this._postgresModel.name)) {
 						await this._postgresModel.delete();
+						await this._controllerModel.deleteRegistration(ResourceType.postgresInstances, this._postgresModel.namespace, this._postgresModel.name);
 						vscode.window.showInformationMessage(loc.resourceDeleted(this._postgresModel.fullName));
 					}
 				} catch (error) {
diff --git a/extensions/arc/src/ui/tree/controllerTreeNode.ts b/extensions/arc/src/ui/tree/controllerTreeNode.ts
index 70b1622164..ed87f249cd 100644
--- a/extensions/arc/src/ui/tree/controllerTreeNode.ts
+++ b/extensions/arc/src/ui/tree/controllerTreeNode.ts
@@ -67,7 +67,7 @@ export class ControllerTreeNode extends TreeNode {
 
 	private refreshChildren(registrations: Registration[]): void {
 		const newChildren: ResourceTreeNode[] = [];
-		registrations.forEach(registration => {
+		registrations.filter(r => !r.isDeleted).forEach(registration => {
 			if (!registration.instanceNamespace || !registration.instanceName) {
 				console.warn('Registration is missing required namespace and name values, skipping');
 				return;