diff --git a/source/conf.py b/source/conf.py
index d28a436..34e66bf 100644
--- a/source/conf.py
+++ b/source/conf.py
@@ -107,7 +107,8 @@
 html_theme_path = [sphinx_rtd_theme.get_html_theme_path()]
 
 with open('namespace_map.yml', 'r') as f:
-    namespace_map = yaml.safe_load(f)
+    yaml_obj = yaml.YAML(typ='safe', pure=True)
+    namespace_map = yaml_obj.load(f)
 
 
 def rstjinja(app, docname, source):