diff --git a/packages/lib/RotatingLogs.test.ts b/packages/lib/RotatingLogs.test.ts
index a0acb38fc..a8990a537 100644
--- a/packages/lib/RotatingLogs.test.ts
+++ b/packages/lib/RotatingLogs.test.ts
@@ -12,7 +12,7 @@ describe('RotatingLogs', () => {
 		try {
 			dir = await createTempDir();
 			await createTestLogFile(dir);
-			let files: string[] = await readdir(dir);
+			let files = await readdir(dir);
 			expect(files.find(file => file.match(/^log.txt$/gi))).toBeTruthy();
 			expect(files.length).toBe(1);
 			const rotatingLogs: RotatingLogs = new RotatingLogs(dir, 1, 1);
@@ -35,7 +35,7 @@ describe('RotatingLogs', () => {
 			await rotatingLogs.cleanActiveLogFile();
 			await msleep(1);
 			await rotatingLogs.deleteNonActiveLogFiles();
-			const files: string[] = await readdir(dir);
+			const files = await readdir(dir);
 			expect(files.find(file => file.match(/^log-[0-9]+.txt$/gi))).toBeFalsy();
 			expect(files.length).toBe(0);
 		} finally {
@@ -52,7 +52,7 @@ describe('RotatingLogs', () => {
 			const rotatingLogs: RotatingLogs = new RotatingLogs(dir, 1, 100);
 			await rotatingLogs.cleanActiveLogFile();
 			await rotatingLogs.deleteNonActiveLogFiles();
-			const files: string[] = await readdir(dir);
+			const files = await readdir(dir);
 			expect(files.find(file => file.match(/^log-[0-9]+.txt$/gi))).toBeTruthy();
 			expect(files.length).toBe(1);
 		} finally {
diff --git a/packages/lib/RotatingLogs.ts b/packages/lib/RotatingLogs.ts
index b3ade3c7a..e1446f840 100644
--- a/packages/lib/RotatingLogs.ts
+++ b/packages/lib/RotatingLogs.ts
@@ -29,7 +29,7 @@ export default class RotatingLogs {
 		const files: Stat[] = await this.fsDriver().readDirStats(this.logFilesDir);
 		for (const file of files) {
 			if (!file.path.match(/^log-[0-9]+.txt$/gi)) continue;
-			const timestamp: string = file.path.match(/[0-9]+/g)[0];
+			const timestamp: number = parseInt(file.path.match(/[0-9]+/g)[0], 10);
 			const ageOfTheFile: number = Date.now() - timestamp;
 			if (ageOfTheFile >= this.inactiveMaxAge) {
 				await this.fsDriver().remove(this.logFileFullpath(file.path));