diff --git a/script-user-add b/script-user-add
index 1b803577..08272639 100755
--- a/script-user-add
+++ b/script-user-add
@@ -27,10 +27,10 @@ if [[ -d /mnt/array/home-retired/"$username" ]]; then
 fi
 
 samba="no"
-ask_ok "Enable shared file access for user $username?" && group_str+="smbgrp" && samba="yes"
+ask_ok "Enable shared file access for user $username?" && group_str="smbgrp" && samba="yes"
 
 ask_ok "Make user $username an admin?" && \
-    group_str=",wheel"
+    group_str+=",wheel"
 
 useradd_cmd+=("-G" "$group_str")
 useradd_cmd+=("$username")