diff --git a/Dockerfile b/Dockerfile
index 4d81b9a..edcfbc4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,8 +5,8 @@ WORKDIR /usr/src/app
 ENV CHECK_INTERVAL_MINUTES 5
 ENV DEBUG ""
 ENV TZ "Europe/Helsinki"
-ENV DOCKER_USER
-ENV DOCKER_AUTH
+ENV DOCKER_USER ""
+ENV DOCKER_AUTH ""
 
 RUN apk add --update \
     python3 \