diff --git a/Dockerfile b/Dockerfile
index 7ed8ab25501d61c9dfc531a0f373671bc67aaa5c..88cb3af7600ee80390d35d78c8b16cf2fd2b72d4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -28,7 +28,8 @@ RUN apt update -y \
             exiftool \
      && rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*
 
-RUN useradd -u $PIWIGO_USER -g $PIWIGO_GROUP user
+RUN groupadd -g $PIWIGO_GROUP_ID user
+RUN useradd -u $PIWIGO_USER_ID -g $PIWIGO_GROUP_ID user
 
 RUN wget -q -O piwigo.zip http://piwigo.org/download/dlcounter.php?code=$PIWIGO_VERSION && \
     unzip piwigo.zip && \