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-rw-r--r--wqflask/utility/tools.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/wqflask/utility/tools.py b/wqflask/utility/tools.py
index 4c331f8a..3dc01b91 100644
--- a/wqflask/utility/tools.py
+++ b/wqflask/utility/tools.py
@@ -158,7 +158,7 @@ def assert_dir(the_dir):
 
 def assert_writable_dir(dir):
     try:
-        fn = dir + "/test.txt"
+        fn = os.path.join(dir, "test.txt")
         fh = open(fn, 'w')
         fh.write("I am writing this text to the file\n")
         fh.close()