diff --git a/packages/backend/src/misc/create-temp.ts b/packages/backend/src/misc/create-temp.ts
index fda63c7a9d..f2138abf66 100644
--- a/packages/backend/src/misc/create-temp.ts
+++ b/packages/backend/src/misc/create-temp.ts
@@ -30,11 +30,11 @@ export function createTempDir(): Promise<[string, () => void]> {
 	});
 }
 
-export async function saveToTempFile(stream: NodeJS.ReadableStream): Promise<string> {
+export async function saveToTempFile(stream: NodeJS.ReadableStream): Promise<[string, () => void]> {
 	const [filepath, cleanup] = await createTemp();
 	try {
 		await pipeline(stream, fs.createWriteStream(filepath));
-		return filepath;
+		return [filepath, cleanup];
 	} catch (e) {
 		cleanup();
 		throw e;
diff --git a/packages/backend/src/server/ServerUtilityService.ts b/packages/backend/src/server/ServerUtilityService.ts
index c2a3132489..00eb97f679 100644
--- a/packages/backend/src/server/ServerUtilityService.ts
+++ b/packages/backend/src/server/ServerUtilityService.ts
@@ -54,7 +54,7 @@ export class ServerUtilityService {
 						}
 					} else { // Otherwise it's a file
 						try {
-							const filepath = await saveToTempFile(part.file);
+							const [filepath] = await saveToTempFile(part.file);
 
 							const tmpUploads = (request.tmpUploads ??= []);
 							tmpUploads.push(filepath);