diff --git a/packer/src/sarasacw_omrf_packer/archiver.py b/packer/src/sarasacw_omrf_packer/archiver.py
index 407cd12..8245811 100644
--- a/packer/src/sarasacw_omrf_packer/archiver.py
+++ b/packer/src/sarasacw_omrf_packer/archiver.py
@@ -48,7 +48,7 @@ class Archiver:
             target_filepath.parent.mkdir(parents=True, exist_ok=True)
 
         if self.__dist_zip is not None:
-            self.__dist_zip.mkdir(str(arcname))
+            self.__dist_zip.mkdir(arcname.as_posix())
 
     def push_file(self, filepath: Path, arcname: Path) -> None:
         """Mirror an existing file into both sinks.
@@ -63,7 +63,7 @@ class Archiver:
             shutil.copy(filepath, target_filepath)
 
         if self.__dist_zip is not None:
-            self.__dist_zip.write(filepath, arcname)
+            self.__dist_zip.write(filepath, arcname.as_posix())
 
     def push_text(self, text: str, arcname: Path) -> None:
         """Mirror in-memory text into both sinks.
@@ -79,7 +79,7 @@ class Archiver:
                 f.write(text)
 
         if self.__dist_zip is not None:
-            self.__dist_zip.writestr(str(arcname), text)
+            self.__dist_zip.writestr(arcname.as_posix(), text)
 
     def __enter__(self) -> "Archiver":
         """Enter the context and return this archiver as the bound target."""