diff --git a/docker-compose/tango-prometheus-exporter/Dockerfile b/docker-compose/tango-prometheus-exporter/Dockerfile
index 4f548bbc1a7ff9eebb906fe912cd7a74992bd558..1df83afa690c008f83868c1bc9c8d6c1a09323ef 100644
--- a/docker-compose/tango-prometheus-exporter/Dockerfile
+++ b/docker-compose/tango-prometheus-exporter/Dockerfile
@@ -12,4 +12,4 @@ RUN pip install -r /code/pip-requirements.txt
 WORKDIR /code
 ENV PYTHONPATH '/code/'
 
-CMD ["python" , "/code/collector.py"]
+CMD ["python", "-u", "/code/collector.py"]