diff --git a/Dockerfile b/Dockerfile
index 2ccf505..53e8bd2 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -4,8 +4,7 @@ RUN apk update && \
     apk upgrade && \
     apk add bash procps drill git coreutils libidn curl socat openssl xxd && \
     rm -rf /var/cache/apk/* && \
-    addgroup testssl && \
-    adduser -G testssl -g "testssl user" -s /bin/bash -D testssl && \
+    adduser -D -s /bin/bash testssl && \
     ln -s /home/testssl/testssl.sh /usr/local/bin/ && \
     mkdir -m 755 -p /home/testssl/etc /home/testssl/bin