diff --git a/geonode/base/models.py b/geonode/base/models.py
index 44d12e412e5..b5907a902ba 100644
--- a/geonode/base/models.py
+++ b/geonode/base/models.py
@@ -1797,6 +1797,7 @@ def get_targets(cls, source: ResourceBase, is_internal: bool = None):
     def resolve_targets(cls, linked_resources):
         return (lr.target for lr in linked_resources)
 
+    @classmethod
     def resolve_sources(cls, linked_resources):
         return (lr.source for lr in linked_resources)