diff --git a/src/_pytest/pytester.py b/src/_pytest/pytester.py
index 603de4b65..8e00f0ebf 100644
--- a/src/_pytest/pytester.py
+++ b/src/_pytest/pytester.py
@@ -1104,8 +1104,7 @@ class Testdir(object):
                     if ret is not None:
                         break
 
-                    remaining = end - time.time()
-                    if remaining <= 0:
+                    if time.time() > end:
                         handle_timeout()
 
                     time.sleep(resolution)