diff --git a/release/cibuild.py b/release/cibuild.py
index c680d5e1f..fa14e4ba1 100755
--- a/release/cibuild.py
+++ b/release/cibuild.py
@@ -346,6 +346,7 @@ def build_wheel(be: BuildEnviron):  # pragma: no cover
 
 def build_docker_image(be: BuildEnviron):  # pragma: no cover
     whl, = glob.glob(os.path.join(be.dist_dir, 'mitmproxy-*-py3-none-any.whl'))
+    whl = str(pathlib.Path(whl).relative_to(pathlib.Path(".").absolute()))
     click.echo("Building Docker images...")
     subprocess.check_call([
         "docker",