diff --git a/rida/pdc.py b/rida/pdc.py
index 04539335..40e4085a 100644
--- a/rida/pdc.py
+++ b/rida/pdc.py
@@ -68,7 +68,7 @@ def get_variant_dict(data):
         return isinstance(data, modulemd.ModuleMetadata)
 
     def is_module_str(data):
-        return isinstance(data, str)
+        return isinstance(data, str) or isinstance(data, unicode)
 
     result = None