diff --git a/test/test_wrapper.py b/test/test_wrapper.py
index 69e2dc2db14cf4d682e2559635754764e45c8fcd..94a00d859c0f6b2428e166af01d1e90e7a061b65 100644
--- a/test/test_wrapper.py
+++ b/test/test_wrapper.py
@@ -834,9 +834,9 @@ def test_event_set_callback(ctx_factory):
         from time import sleep
         sleep(0.01)
 
-        # wait up to a second
+        # wait up to five seconds (?!)
         counter += 1
-        if counter >= 100:
+        if counter >= 500:
             break
 
     assert got_called