diff --git a/optional_plugins/loader_yaml/avocado_loader_yaml/__init__.py b/optional_plugins/loader_yaml/avocado_loader_yaml/__init__.py
index 574308b9f899bcc8c093504c6d3f86913fa58b73..92202c4ad1cfa1ca6e138ad8db0685cf4fcda9bb 100644
--- a/optional_plugins/loader_yaml/avocado_loader_yaml/__init__.py
+++ b/optional_plugins/loader_yaml/avocado_loader_yaml/__init__.py
@@ -89,6 +89,8 @@ class YamlTestsuiteLoader(loader.TestLoader):
             for key, value in iteritems(_args):
                 setattr(args, key, value)
         extra_params = params.get("test_reference_resolver_extra", default={})
+        if extra_params:
+            extra_params = copy.deepcopy(extra_params)
         return loader_class(args, extra_params)
 
     def discover(self, reference, which_tests=loader.DEFAULT):