diff --git a/src/blocking-queue.test.ts b/src/blocking-queue.test.ts
index f3a8f07..1766326 100644
--- a/src/blocking-queue.test.ts
+++ b/src/blocking-queue.test.ts
@@ -78,7 +78,7 @@ describe('BlockingQueue', () => {
       expect(await queue.dequeue()).toBe(1);
       expect(Date.now() - startTime).toBeLessThan(2000);
       expect(await queue.dequeue()).toBe(2);
-      expect(Date.now() - startTime).toBeGreaterThanOrEqual(2000);
+      expect(Math.ceil(Date.now() - startTime)).toBeGreaterThanOrEqual(2000);
 
       queue.done();
     });
@@ -179,7 +179,7 @@ describe('BlockingQueue', () => {
       expect(await queue.dequeue()).toBe(1);
       const startTime = Date.now();
       expect(await queue.dequeue()).toBe(2);
-      const duration = Date.now() - startTime;
+      const duration = Math.ceil(Date.now() - startTime);
       expect(duration).toBeGreaterThanOrEqual(2000);
 
       queue.done();
diff --git a/src/iterable-queue.test.ts b/src/iterable-queue.test.ts
index f78dcce..8290e92 100644
--- a/src/iterable-queue.test.ts
+++ b/src/iterable-queue.test.ts
@@ -74,7 +74,7 @@ describe('IterableQueue', () => {
       for await (const item of queue) {
         expect(item).toBe(items[iteratedCount]);
         iteratedCount++;
-        expect(Date.now() - startTime).toBeGreaterThanOrEqual(2000);
+        expect(Math.ceil(Date.now() - startTime)).toBeGreaterThanOrEqual(2000);
       }
 
       expect(iteratedCount).toBe(2);
@@ -159,7 +159,7 @@ describe('IterableQueue', () => {
       for await (const item of queue) {
         expect(item).toBe(items[iteratedCount]);
         iteratedCount++;
-        expect(Date.now() - startTime).toBeGreaterThanOrEqual(2000);
+        expect(Math.ceil(Date.now() - startTime)).toBeGreaterThanOrEqual(2000);
       }
 
       expect(iteratedCount).toBe(2);