diff --git a/Casks/salt.rb b/Casks/salt.rb
index b706ce7..1a9fff8 100644
--- a/Casks/salt.rb
+++ b/Casks/salt.rb
@@ -23,7 +23,7 @@
     random_str = (0...8).map { rand(65..90).chr }.join
     %w[api master minion syndic].each do |daemon|
       plist_file = "/Library/LaunchDaemons/com.saltstack.salt.#{daemon}.plist"
-      xml, = system_command! "plutil",
+      xml, = system_command "plutil",
                              args: ["-convert", "xml1", "-o", "-", "--", plist_file],
                              sudo: true
       xml = Plist.parse_xml(xml)
@@ -38,13 +38,13 @@
 
       new_plist_file = "/tmp/#{random_str}.#{File.basename(plist_file)}"
       File.write(new_plist_file, xml.to_plist)
-      system_command! "plutil",
+      system_command "plutil",
                       args: ["-lint", new_plist_file]
 
-      system_command! "mv",
+      system_command "mv",
                       args: [new_plist_file, plist_file],
                       sudo: true
-      system_command! "chown",
+      system_command "chown",
                       args: ["root:wheel", plist_file],
                       sudo: true
     end