diff --git a/scripts/debian/preinst b/scripts/debian/preinst
index 8c7b38e..f000a2e 100644
--- a/scripts/debian/preinst
+++ b/scripts/debian/preinst
@@ -1,4 +1,4 @@
 if [ -x /usr/sbin/useradd ]; then \
  /usr/bin/getent group proxy >/dev/null || (/usr/sbin/groupadd -f -r proxy || true); \
- /usr/bin/getent passwd proxy >/dev/null || (/usr/sbin/useradd -UMr -s /bin/false -c 3proxy proxy || true); \
+ /usr/bin/getent passwd proxy >/dev/null || (/usr/sbin/useradd -Mr -s /bin/false -g proxy -c 3proxy proxy || true); \
 fi
diff --git a/scripts/rh/3proxy.spec b/scripts/rh/3proxy.spec
index 4d61257..7ded097 100644
--- a/scripts/rh/3proxy.spec
+++ b/scripts/rh/3proxy.spec
@@ -77,7 +77,7 @@ make clean
 %pre
 if [ -x /usr/sbin/useradd ]; then \
  /usr/bin/getent group proxy >/dev/null || (/usr/sbin/groupadd -f -r proxy || true); \
- /usr/bin/getent passwd proxy >/dev/null || (/usr/sbin/useradd -UMr -s /bin/false -c 3proxy proxy || true); \
+ /usr/bin/getent passwd proxy >/dev/null || (/usr/sbin/useradd -Mr -s /bin/false -g proxy -c 3proxy proxy || true); \
 fi
 
 %post