diff --git a/Dockerfile b/Dockerfile
index 6efdb9b..3832cf4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 FROM vikunja/frontend
 
-RUN apt-get update && apt-get install -y openssl && \
-  add openssl && `# Prepare dummy SSL certificates` \
+RUN apt-get update && apt-get install -y apt-utils openssl && \
+  `# Prepare dummy SSL certificates` \
   mkdir -p /etc/nginx/ssl && \
   openssl genrsa -out /etc/nginx/ssl/dummy.key 2048 && \
   openssl req -new -key /etc/nginx/ssl/dummy.key -out /etc/nginx/ssl/dummy.csr -subj "/C=GB/L=London/O=Company Ltd/CN=docker" && \