diff --git a/Library/Homebrew/requirements/ruby_requirement.rb b/Library/Homebrew/requirements/ruby_requirement.rb
index 327c131708..acc6559248 100644
--- a/Library/Homebrew/requirements/ruby_requirement.rb
+++ b/Library/Homebrew/requirements/ruby_requirement.rb
@@ -11,7 +11,7 @@ class RubyRequirement < Requirement
   satisfy(build_env: false) { new_enough_ruby }
 
   env do
-    ENV.prepend_path "PATH", new_enough_ruby
+    ENV.prepend_path "PATH", new_enough_ruby.dirname
   end
 
   def message