diff --git a/test/tool_shed/functional_tests.py b/test/tool_shed/functional_tests.py
index 7116303ca5b..14ad597639f 100644
--- a/test/tool_shed/functional_tests.py
+++ b/test/tool_shed/functional_tests.py
@@ -129,7 +129,7 @@ def main():
             else:
                 database_connection = 'sqlite:///' + os.path.join( db_path, 'universe.sqlite' )
             kwargs = {}
-        for dir in tool_shed_test_tmp_dir:
+        for dir in [ tool_shed_test_tmp_dir ]:
             try:
                 os.makedirs( dir )
             except OSError: