diff --git a/processing/post/postResults.py b/processing/post/postResults.py
index 45093da30..d0fba76ab 100755
--- a/processing/post/postResults.py
+++ b/processing/post/postResults.py
@@ -986,7 +986,7 @@ groups.sort(key = sortKeys)
 
 # ---------------------------   create output dir   --------------------------------
 
-dirname = os.path.abspath(os.path.dirname(filename))+os.sep+options.dir
+dirname = os.path.abspath(os.path.join(os.path.dirname(filename),options.dir))
 if not os.path.isdir(dirname):
   os.mkdir(dirname,0755)