diff --git a/Dockerfile b/Dockerfile
index f55fa85..8dc9a5d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ RUN \
   tar -xjf ${ArduinoPackage} && \
   mv $Filename /usr/bin/arduino-cli && \
   groupadd -r -g $ArduinoGID $USER && \
-  useradd -m -r -u $ArduinoUID -g $USER $USER
+  useradd -m -r -u $ArduinoUID -g $USER -G dialout $USER
 
 USER $USER
 WORKDIR /home/$USER