--- a/icqsol_utils.py	Wed Dec 09 11:00:05 2015 -0500
+++ b/icqsol_utils.py	Wed Dec 09 11:00:19 2015 -0500
@@ -50,7 +50,13 @@
     """
     Return a temporary file name.
     """
-    fd, name = tempfile.mkstemp(suffix=suffix, dir=dir)
+    if suffix is None:
+        s = None
+    elif suffix.startswith('.'):
+        s = suffix
+    else:
+        s = '.%s' % suffix
+    fd, name = tempfile.mkstemp(suffix=s, dir=dir)
     os.close(fd)
     return name