diff --git a/dataflows/processors/add_metadata.py b/dataflows/processors/add_metadata.py
index 564b462..ffba974 100644
--- a/dataflows/processors/add_metadata.py
+++ b/dataflows/processors/add_metadata.py
@@ -1,5 +1,12 @@
+import copy
+
+
 def add_metadata(**metadata):
 
+    metadata = copy.deepcopy(metadata)
+    if 'resources' in metadata:
+        del metadata['resources']
+
     def func(package):
         package.pkg.descriptor.update(metadata)
         yield package.pkg