diff --git a/server/src/annotation.py b/server/src/annotation.py
index a11e0fe1b..ed5c4b42d 100755
--- a/server/src/annotation.py
+++ b/server/src/annotation.py
@@ -17,7 +17,7 @@
 from codecs import open as codecs_open
 from functools import partial
 from itertools import chain, takewhile
-from os import utime
+from os import close as os_close, utime
 from time import time
 from os.path import join as path_join
 from os.path import basename, splitext
@@ -964,7 +964,8 @@ def __exit__(self, type, value, traceback):
                 #       so we hack around it.
                 #with NamedTemporaryFile('w', suffix='.ann') as tmp_file:
                 # Grab the filename, but discard the handle
-                _, tmp_fname = mkstemp(suffix='.ann')
+                tmp_fh, tmp_fname = mkstemp(suffix='.ann')
+                os_close(tmp_fh)
                 try:
                     with open_textfile(tmp_fname, 'w') as tmp_file:
                         #XXX: Temporary hack to make sure we don't write corrupted
diff --git a/server/src/download.py b/server/src/download.py
index a846dd9e3..64ee0f0c8 100644
--- a/server/src/download.py
+++ b/server/src/download.py
@@ -7,7 +7,7 @@
 
 from __future__ import with_statement
 
-from os import remove
+from os import close as os_close, remove
 from os.path import join as path_join, dirname, basename
 from tempfile import mkstemp
 
@@ -42,7 +42,9 @@ def download_collection(collection, exclude_configs=False):
 
     tmp_file_path = None
     try:
-        _, tmp_file_path = mkstemp()
+        tmp_file_fh, tmp_file_path = mkstemp()
+        os_close(tmp_file_fh)
+
         tar_cmd_split = ['tar', '--exclude=.stats_cache']
         if exclude_configs:
             tar_cmd_split.extend(['--exclude=annotation.conf',
diff --git a/server/src/session.py b/server/src/session.py
index c5f92d5ed..12da5835e 100755
--- a/server/src/session.py
+++ b/server/src/session.py
@@ -231,7 +231,8 @@ def load_conf():
     init_session('127.0.0.1')
     tmp_file_path = None
     try:
-        _, tmp_file_path = mkstemp()
+        tmp_file_fh, tmp_file_path = mkstemp()
+        os_close(tmp_file_fh)
         session = get_session()
         session['foo'] = 'bar'
         with open(tmp_file_path, 'wb') as tmp_file: