diff --git a/Library/Homebrew/dev-cmd/ruby.rb b/Library/Homebrew/dev-cmd/ruby.rb
index 2df2123014..c5696d6bba 100755
--- a/Library/Homebrew/dev-cmd/ruby.rb
+++ b/Library/Homebrew/dev-cmd/ruby.rb
@@ -8,6 +8,6 @@ module Homebrew
   module_function
 
   def ruby
-    exec ENV["HOMEBREW_RUBY_PATH"], "-I#{HOMEBREW_LIBRARY_PATH}", "-rglobal", "-rcmd/irb", *ARGV
+    exec ENV["HOMEBREW_RUBY_PATH"], "-I#{HOMEBREW_LIBRARY_PATH}", "-rglobal", "-rdev-cmd/irb", *ARGV
   end
 end
diff --git a/Library/Homebrew/test/dev-cmd/ruby_spec.rb b/Library/Homebrew/test/dev-cmd/ruby_spec.rb
new file mode 100644
index 0000000000..e05bccc833
--- /dev/null
+++ b/Library/Homebrew/test/dev-cmd/ruby_spec.rb
@@ -0,0 +1,13 @@
+describe "brew ruby", :integration_test do
+  it "executes ruby code with Homebrew's libraries loaded" do
+    expect { brew "ruby", "-e", "exit 0" }
+      .to be_a_success
+      .and not_to_output.to_stdout
+      .and not_to_output.to_stderr
+
+    expect { brew "ruby", "-e", "exit 1" }
+      .to be_a_failure
+      .and not_to_output.to_stdout
+      .and not_to_output.to_stderr
+  end
+end