diff --git a/tests/Foundatio.Tests/Caching/InMemoryCacheClientTests.cs b/tests/Foundatio.Tests/Caching/InMemoryCacheClientTests.cs
index 13a18d28..b88b3976 100644
--- a/tests/Foundatio.Tests/Caching/InMemoryCacheClientTests.cs
+++ b/tests/Foundatio.Tests/Caching/InMemoryCacheClientTests.cs
@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Collections.Generic;
 using System.Threading.Tasks;
 using Foundatio.Caching;
@@ -194,7 +194,9 @@ public async Task SetAllShouldExpire()
 
         var expiry = TimeSpan.FromMilliseconds(50);
         await client.SetAllAsync(new Dictionary<string, object> { { "test", "value" } }, expiry);
-        await Task.Delay(expiry);
+
+        // Add 1ms to the expiry to ensure the cache has expired as the delay window is not guaranteed to be exact.
+        await Task.Delay(expiry.Add(TimeSpan.FromMilliseconds(1)));
 
         Assert.False(await client.ExistsAsync("test"));
     }