diff --git a/test/benchmark/test_benchmark.rb b/test/benchmark/test_benchmark.rb
index 59207c71f7..1b9964eafa 100644
--- a/test/benchmark/test_benchmark.rb
+++ b/test/benchmark/test_benchmark.rb
@@ -156,6 +156,6 @@ BENCH
   def test_realtime_output
     sleeptime = 1.0
     realtime = Benchmark.realtime { sleep sleeptime }
-    assert_in_epsilon sleeptime, realtime
+    assert_operator sleeptime, :<, realtime
   end
 end