diff --git a/Lib/test/test_syntax.py b/Lib/test/test_syntax.py
index 88503dc..43780ce 100644
--- a/Lib/test/test_syntax.py
+++ b/Lib/test/test_syntax.py
@@ -59,6 +59,10 @@
 Traceback (most recent call last):
 SyntaxError: cannot assign to __debug__
 
+>>> del __debug__
+Traceback (most recent call last):
+SyntaxError: cannot delete __debug__
+
 >>> f() = 1
 Traceback (most recent call last):
 SyntaxError: cannot assign to function call here. Maybe you meant '==' instead of '='?