diff --git a/Dockerfile b/Dockerfile
index a726993..9ef346e 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -6,7 +6,7 @@ ENV GUID=100
 
 RUN deluser node
 
-RUN adduser -u $UID foundry foundry
+RUN adduser -u $UID -g foundry foundry
 
 USER foundry