diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index 533c8250e0..8cf1f9066f 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -241,11 +241,16 @@ export class ApRequestService {
 				if (alternate) {
 					const href = alternate.getAttribute('href');
 					if (href) {
+						// Since this early exits, we need to call DetachedWindowAPI.close
+						await window.happyDOM.close();
+
 						return await this.signedGet(href, user, false);
 					}
 				}
 			} catch (e) {
 				// something went wrong parsing the HTML, ignore the whole thing
+			} finally {
+				await window.happyDOM.close();
 			}
 		}
 		//#endregion