diff --git a/Lib/tempfile.py b/Lib/tempfile.py
index 3682180..756d8c8 100644
--- a/Lib/tempfile.py
+++ b/Lib/tempfile.py
@@ -38,15 +38,21 @@
 
 try:
     import fcntl as _fcntl
+    # If PYTHONCASEOK is set on Windows, stinking FCNTL.py gets
+    # imported, and we don't get an ImportError then.  Provoke
+    # an AttributeError instead in that case.
+    _fcntl.fcntl
+except (ImportError, AttributeError):
+    def _set_cloexec(fd):
+        pass
+else:
     def _set_cloexec(fd):
         flags = _fcntl.fcntl(fd, _fcntl.F_GETFD, 0)
         if flags >= 0:
             # flags read successfully, modify
             flags |= _fcntl.FD_CLOEXEC
             _fcntl.fcntl(fd, _fcntl.F_SETFD, flags)
-except (ImportError, AttributeError):
-    def _set_cloexec(fd):
-        pass
+
 
 try:
     import thread as _thread
diff --git a/Misc/NEWS b/Misc/NEWS
index ce7aba2..7ba1218 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -39,6 +39,9 @@
 Windows
 -------
 
+- The tempfile module could do insane imports on Windows if PYTHONCASEOK
+  was set, making temp file creation impossible.  Repaired.
+
 Mac
 ---