diff --git a/duplicacy/dockerfile b/duplicacy/dockerfile
index 74504b0..6a70710 100644
--- a/duplicacy/dockerfile
+++ b/duplicacy/dockerfile
@@ -4,7 +4,7 @@ FROM ${BUILD_FROM}
 ENV LANG C.UTF-8
 
 # Install cron
-RUN apt-get -y install cron
+RUN apt -y install cron
 
 # Copy data for add-on
 COPY run.sh /