diff --git a/install-nix.sh b/install-nix.sh
index 03447c3..d6a09c9 100755
--- a/install-nix.sh
+++ b/install-nix.sh
@@ -54,7 +54,7 @@ else
   add_config "build-users-group ="
   sudo mkdir -p /etc/nix
   sudo chmod 0755 /etc/nix
-  sudo cp $workdir/nix.conf /etc/nix/nix.conf
+  sudo cp "$workdir/nix.conf" /etc/nix/nix.conf
 fi
 
 if [[ $INPUT_INSTALL_OPTIONS != "" ]]; then