diff --git a/Lib/curses/has_key.py b/Lib/curses/has_key.py
index 1dd5a3bd4a4..60b7be99426 100644
--- a/Lib/curses/has_key.py
+++ b/Lib/curses/has_key.py
@@ -182,7 +182,7 @@ if __name__ == '__main__':
         L = []
         _curses.initscr()
         for key in _capability_names.keys():
-            system = key in _curses
+            system = _curses.has_key(key)
             python = has_key(key)
             if system != python:
                 L.append( 'Mismatch for key %s, system=%i, Python=%i'
diff --git a/Misc/NEWS.d/next/Library/2018-04-25-22-41-04.bpo-33359.Nr4CzK.rst b/Misc/NEWS.d/next/Library/2018-04-25-22-41-04.bpo-33359.Nr4CzK.rst
new file mode 100644
index 00000000000..5a90f2f09ce
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2018-04-25-22-41-04.bpo-33359.Nr4CzK.rst
@@ -0,0 +1 @@
+Fix running ``python -m curses.has_key``.