diff --git a/src/freedombone-utils-setup b/src/freedombone-utils-setup
index 4b56b06f..83f79218 100755
--- a/src/freedombone-utils-setup
+++ b/src/freedombone-utils-setup
@@ -108,7 +108,7 @@ function initial_setup {
 }
 
 function admin_user_sudo {
-    if ! grep "$MY_USERNAME  ALL=(ALL) ALL" $rootdir/etc/sudoers; then
+    if ! grep -q "$MY_USERNAME  ALL=(ALL) ALL" $rootdir/etc/sudoers; then
         echo "$MY_USERNAME  ALL=(ALL) ALL" >> $rootdir/etc/sudoers
     fi
 }