diff --git a/archplasma/Dockerfile b/archplasma/Dockerfile
index 3c64d4e..ff9e0c7 100644
--- a/archplasma/Dockerfile
+++ b/archplasma/Dockerfile
@@ -24,8 +24,8 @@ RUN --mount=type=cache,sharing=locked,target=/var/cache/pacman \
         shotwell ffmpegthumbs ark okular \
     && pacman -Scc --ask 4 \
     && useradd --create-home --gid users --shell /usr/bin/bash user \
-    && echo 'user ALL=(ALL:ALL) NOPASSWD: /usr/bin/pacman -S' >/etc/sudoers.d/zz-DOCKER \
-    && echo 'Defaults lecture = never' >>/etc/sudoers.d/zz-DOCKER \
+    && printf '%s\n' 'user ALL=(ALL:ALL) NOPASSWD: /usr/bin/pacman -S' \
+        'Defaults lecture = never' >/etc/sudoers.d/zz-DOCKER \
     && passwd -l root >/dev/null 2>&1
 
 # configure nvidia container runtime