diff --git a/Dockerfile b/Dockerfile
index 727c81c..fb15b64 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -5,7 +5,7 @@ ENV UID=99
 ENV GUID=100
 
 RUN deluser node
-RUN addgroup -G $GUID
+RUN addgroup -g $GUID
 RUN adduser -u $UID foundry -G $GUID
 
 USER foundry