diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index 418656fdb..c07389d97 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -199,7 +199,7 @@ export class SignupApiService {
 			reply.code(204);
 			return;
 		} else if (instance.approvalRequiredForSignup) {
-			await this.signupService.signup({
+			const { account } = await this.signupService.signup({
 				username, password, host, reason,
 			});
 
@@ -209,6 +209,14 @@ export class SignupApiService {
 					'Congratulations! Your account is now pending approval. You will get notified when you have been accepted.');
 			}
 
+			if (ticket) {
+				await this.registrationTicketsRepository.update(ticket.id, {
+					usedAt: new Date(),
+					usedBy: account,
+					usedById: account.id,
+				});
+			}
+
 			reply.code(204);
 			return;
 		} else {