diff --git a/astrbot/core/computer/computer_client.py b/astrbot/core/computer/computer_client.py
index 9be646265e..0b0264eadf 100644
--- a/astrbot/core/computer/computer_client.py
+++ b/astrbot/core/computer/computer_client.py
@@ -504,7 +504,8 @@ async def _sync_skills_to_sandbox(booter: ComputerBooter) -> None:
             for skill_name, skill_dir in sync_skill_dirs:
                 shutil.copytree(skill_dir, bundle_root / skill_name)
             shutil.make_archive(str(zip_base), "zip", str(bundle_root))
-            remote_zip = Path(SANDBOX_SKILLS_ROOT) / "skills.zip"
+            # Force forward slashes for sandbox compatibility.
+            remote_zip = (Path(SANDBOX_SKILLS_ROOT) / "skills.zip").as_posix()
             logger.info("Uploading skills bundle to sandbox...")
             await booter.shell.exec(f"mkdir -p {SANDBOX_SKILLS_ROOT}")
             upload_result = await booter.upload_file(str(zip_path), str(remote_zip))