diff --git a/hepcrawl/pipelines.py b/hepcrawl/pipelines.py
index 4ff2b3c9..7a51e4cb 100644
--- a/hepcrawl/pipelines.py
+++ b/hepcrawl/pipelines.py
@@ -125,7 +125,8 @@ def _prepare_payload(self, spider):
         ]
         return payload
 
-    def _cleanup(self, spider):
+    @staticmethod
+    def _cleanup(spider):
         """Run cleanup."""
         # Cleanup errors
         if 'errors' in spider.state: