diff --git a/Dockerfile b/Dockerfile
index ca3a987..a35e04f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,4 +8,4 @@ RUN go get github.com/Luzifer/password && \
 EXPOSE 3000
 
 ENTRYPOINT ["/go/bin/password"]
-CMD ["serve", "--port", "3000"]
+CMD ["serve", "--port=3000"]