diff --git a/lib/autoupdate/start.rb b/lib/autoupdate/start.rb
index 12a9f57..68ea4e6 100644
--- a/lib/autoupdate/start.rb
+++ b/lib/autoupdate/start.rb
@@ -95,7 +95,7 @@ def start(interval:, args:)
     set_env << "\nexport HOMEBREW_CASK_OPTS=#{env_cask}" if env_cask
 
     if args.sudo?
-      set_env << "\nexport SUDO_ASKPASS=#{Autoupdate::Core.location/"brew_autoupdate_sudo_gui"}"
+      set_env << "\nexport SUDO_ASKPASS='#{Autoupdate::Core.location/"brew_autoupdate_sudo_gui"}'"
       sudo_gui_script_contents = <<~EOS
       #!/bin/sh
       export PATH='#{env_path}'