diff --git a/Dockerfile b/Dockerfile
index 7559306..57ba318 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -84,7 +84,10 @@ RUN groupadd -g 568 apps && useradd -u 568 -g apps -m -s /bin/bash appuser \
 
 WORKDIR /app
 USER appuser
-ENV HF_HOME=/models/huggingface INSIGHTFACE_HOME=/models/.insightface
+# PYTHONPATH=/app makes the winnow package importable from the entry point script.
+# uv sync builds the wheel before winnow/ is COPY'd, so site-packages has only
+# the dist-info. Explicitly adding /app lets Python find winnow/__init__.py there.
+ENV HF_HOME=/models/huggingface INSIGHTFACE_HOME=/models/.insightface PYTHONPATH=/app
 
 HEALTHCHECK CMD test -f /app/entrypoint.sh || exit 1
 ENTRYPOINT ["tini", "--", "/app/entrypoint.sh"]