diff --git a/upsmon/Dockerfile b/upsmon/Dockerfile
index 475632d..f20674f 100644
--- a/upsmon/Dockerfile
+++ b/upsmon/Dockerfile
@@ -10,7 +10,7 @@ COPY shutdown.sh /
 RUN echo "http://dl-cdn.alpinelinux.org/alpine/edge/main" >> /etc/apk/repositories && \
     echo "http://dl-cdn.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories && \
     echo "http://dl-cdn.alpinelinux.org/alpine/edge/testing" >> /etc/apk/repositories && \
-    apk add -U jq nut curl  && \
+    apk add -U jq nut curl util-linux && \
     mkdir /var/run/nut  && \
     chown root:nut /var/run/nut && \
     chmod 770 /var/run/nut && \