diff --git a/nix-installer.sh b/nix-installer.sh
index 89106ec9..62a58caa 100755
--- a/nix-installer.sh
+++ b/nix-installer.sh
@@ -358,7 +358,7 @@ check_help_for() {
     shift
 
     local _category
-    if "$_cmd" --help | grep -q 'For all options use the manual or "--help all".'; then
+    if "$_cmd" --help | grep -q '"--help all"'; then
       _category="all"
     else
       _category=""