diff --git a/src/python/jw/pkg/lib/ExecContext.py b/src/python/jw/pkg/lib/ExecContext.py
index 5441d8c9..4aab01fe 100644
--- a/src/python/jw/pkg/lib/ExecContext.py
+++ b/src/python/jw/pkg/lib/ExecContext.py
@@ -236,6 +236,10 @@ class ExecContext(Base):
                 raise e
             return result
 
+    @classmethod
+    def __mode_str(cls, mode: int) -> str:
+        return f'{mode:0o}'
+
     def __init__(self, uri: str, interactive: bool|None=None, verbose_default=False):
         super().__init__(uri=uri, interactive=interactive, verbose_default=verbose_default)
 
@@ -580,4 +584,4 @@ class ExecContext(Base):
         await self.run(['chown', ownership, path], cmd_input=InputMode.NonInteractive)
 
     async def _chmod(self, path: str, mode: int) -> None:
-        await self.run(['chmod', oct(mode), path], cmd_input=InputMode.NonInteractive)
+        await self.run(['chmod', self.__mode_str(mode), path], cmd_input=InputMode.NonInteractive)