diff --git a/cdist/exec/util.py b/cdist/exec/util.py
index e3be2235..90a26ad3 100644
--- a/cdist/exec/util.py
+++ b/cdist/exec/util.py
@@ -22,6 +22,7 @@
 import subprocess
 import os
 from tempfile import TemporaryFile
+from collections import OrderedDict
 
 import cdist
 import cdist.configuration
@@ -201,7 +202,7 @@ def resolve_conf_dirs(configuration, add_conf_dirs):
         conf_dirs.extend(add_conf_dirs)
 
     # Remove duplicates.
-    conf_dirs = list(dict.fromkeys(conf_dirs))
+    conf_dirs = list(OrderedDict.fromkeys(conf_dirs))
     return conf_dirs