diff --git a/functional/test_default_parameters.py b/functional/test_default_parameters.py
index 3e00c35..a33823f 100644
--- a/functional/test_default_parameters.py
+++ b/functional/test_default_parameters.py
@@ -75,7 +75,7 @@
 
         if not self.temp_def:
             # remove the default from the parameter in the nested template.
-            ntempl = yaml.load(self.nested_template)
+            ntempl = yaml.safe_load(self.nested_template)
             del ntempl['parameters']['length']['default']
             nested_template = yaml.dump(ntempl)
         else: