diff --git a/Library/Homebrew/cask/artifact/moved.rb b/Library/Homebrew/cask/artifact/moved.rb
index 429a0945a8..ab5212d0f8 100644
--- a/Library/Homebrew/cask/artifact/moved.rb
+++ b/Library/Homebrew/cask/artifact/moved.rb
@@ -92,7 +92,7 @@ module Cask
 
         if target.directory?
           if target.writable?
-            source.children.each { |child| FileUtils.move(child, target + child.basename) }
+            source.children.each { |child| FileUtils.move(child, target/child.basename) }
           else
             source.children.each do |child|
               command.run!("/bin/cp", args: ["-pR", child, target/child.basename],