diff --git a/src/python/jw/pkg/lib/FileContext.py b/src/python/jw/pkg/lib/FileContext.py
index c2ceba08..b77e91f6 100644
--- a/src/python/jw/pkg/lib/FileContext.py
+++ b/src/python/jw/pkg/lib/FileContext.py
@@ -241,7 +241,7 @@ class FileContext(abc.ABC):
         raise NotImplementedError(f'{self.log_name}: mktemp("{path}") is not implemented')
 
     async def mktemp(self, tmpl: str, directory: bool=False) -> None:
-        return await self._mktemp(_chroot(tmpl), directory)
+        return await self._mktemp(self._chroot(tmpl), directory)
 
     async def _chown(self, path: str, owner: str|None, group: str|None) -> None:
         raise NotImplementedError(f'{self.log_name}: chown("{path}") is not implemented')