diff --git a/management/mail_log.py b/management/mail_log.py
index 34bc7630..a641ef7d 100755
--- a/management/mail_log.py
+++ b/management/mail_log.py
@@ -72,9 +72,9 @@ def scan_files(collector):
         if not os.path.exists(fn):
             continue
         if fn[-3:] == '.gz':
-            tmp_file = tempfile.NamedTemporaryFile()
-            with gzip.open(fn, 'rb') as f:
-                shutil.copyfileobj(f, tmp_file)
+            with tempfile.NamedTemporaryFile(delete=False) as tmp_file:
+                with gzip.open(fn, 'rb') as f:
+                    shutil.copyfileobj(f, tmp_file)
 
         if VERBOSE:
             print("Processing file", fn, "...")