diff --git a/Dockerfile b/Dockerfile
index 365bfd9..333db2e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -22,4 +22,4 @@ RUN pip3 install -r /data/requirements.txt && \
 
 EXPOSE 1025
 
-CMD [ "/bin/sh", "-c", "/usr/bin/python3", "/data/smtp2slack4qnap.py" ]
+CMD [ "/bin/sh", "-c", "/usr/bin/python3 /data/smtp2slack4qnap.py" ]