diff --git a/Lib/test/test_io.py b/Lib/test/test_io.py
index 8686f22535f..d2ad2a6aa72 100644
--- a/Lib/test/test_io.py
+++ b/Lib/test/test_io.py
@@ -2484,7 +2484,7 @@ class SignalsTest(unittest.TestCase):
         signal.signal(signal.SIGALRM, self.oldalrm)
 
     def alarm_interrupt(self, sig, frame):
-        1/0
+        1 // 0
 
     @unittest.skipUnless(threading, 'Threading required for this test.')
     def check_interrupted_write(self, item, bytes, **fdopen_kwargs):