diff --git a/Library/Homebrew/os/mac/xcode.rb b/Library/Homebrew/os/mac/xcode.rb
index 8ff3d0bb31..1d70c39812 100644
--- a/Library/Homebrew/os/mac/xcode.rb
+++ b/Library/Homebrew/os/mac/xcode.rb
@@ -229,6 +229,7 @@ module OS
 
       def minimum_version
         case MacOS.version
+        when "10.13" then "9.0.0"
         when "10.12" then "8.0.0"
         else "1.0.0"
         end