diff --git a/TUnit.Assertions.Tests/WaitsForAssertionTests.cs b/TUnit.Assertions.Tests/WaitsForAssertionTests.cs
index e84417729c..4c0c3e51f2 100644
--- a/TUnit.Assertions.Tests/WaitsForAssertionTests.cs
+++ b/TUnit.Assertions.Tests/WaitsForAssertionTests.cs
@@ -56,8 +56,10 @@ public async Task WaitsFor_Fails_When_Timeout_Expires()
 
         stopwatch.Stop();
 
-        // Verify timeout was respected (should be close to 100ms, not significantly longer)
-        await Assert.That(stopwatch.Elapsed).IsLessThan(TimeSpan.FromSeconds(1));
+        // Lower bound proves the timeout actually fired at the right moment. An upper bound
+        // here is a flake magnet — slow CI workers can spend >1s in exception construction
+        // and assertion-machinery cost after the timeout fires correctly.
+        await Assert.That(stopwatch.Elapsed).IsGreaterThanOrEqualTo(TimeSpan.FromMilliseconds(100));
 
         // Verify error message contains useful information
         await Assert.That(exception.Message).Contains("assertion did not pass within 100ms");