diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index a83d20f434394c8..219a08abd3ffd8c 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1568,6 +1568,10 @@ def run_child(self, child, terminal_input):
             self.fail("got %d lines in pipe but expected 2, child output was:\n%s"
                       % (len(lines), child_output))
         os.close(fd)
+
+        pid, status = os.waitpid(pid, 0)
+        self.assertEqual(status, 0)
+
         return lines
 
     def check_input_tty(self, prompt, terminal_input, stdio_encoding=None):