diff --git a/src/kolibri2zim/scraper.py b/src/kolibri2zim/scraper.py
index a75dcce..649704a 100644
--- a/src/kolibri2zim/scraper.py
+++ b/src/kolibri2zim/scraper.py
@@ -96,8 +96,8 @@ def wrapper(self, item):
         try:
             node_id, kind = item
             return func(self, item)
-        except Exception as ex:
-            raise RuntimeError(f"Failed to process {kind} node {node_id}") from ex
+        except Exception as exc:
+            raise RuntimeError(f"Failed to process {kind} node {node_id}") from exc
 
     return wrapper