diff --git a/src/python/jw/pkg/lib/CopyContext.py b/src/python/jw/pkg/lib/CopyContext.py
index cae43bac..5e731736 100644
--- a/src/python/jw/pkg/lib/CopyContext.py
+++ b/src/python/jw/pkg/lib/CopyContext.py
@@ -66,7 +66,7 @@ class CopyContext:
         return self.__dst
 
     async def _run(self) -> None:
-        await self._run()
+        raise NotImplementedError('CopyContext._run() must be overridden')
 
     async def run(self) -> None:
         await self._run()