diff --git a/Library/Homebrew/rubocops/lines_cop.rb b/Library/Homebrew/rubocops/lines_cop.rb
index 7ee1833a18..0ba3c6bc52 100644
--- a/Library/Homebrew/rubocops/lines_cop.rb
+++ b/Library/Homebrew/rubocops/lines_cop.rb
@@ -167,12 +167,12 @@ module RuboCop
             problem "Use `depends_on :fortran` instead of `ENV.fortran`"
           end
 
-          # find_instance_method_call(body_node, :ARGV, :include?) do |m|
-          #   param = parameters(m).first
-          #   next unless match = regex_match_group(param, %r{--(HEAD|devel)})
-          #   problem "Use \"if build.#{match[1].downcase}?\" instead"
-          # end
-          #
+          find_instance_method_call(body_node, "ARGV", :include?) do |m|
+            param = parameters(m).first
+            next unless match = regex_match_group(param, %r{--(HEAD|devel)})
+            problem "Use \"if build.#{match[1].downcase}?\" instead"
+          end
+
           # find_const(body_node, :MACOS_VERSION) do
           #   problem "Use MacOS.version instead of MACOS_VERSION"
           # end
diff --git a/Library/Homebrew/test/rubocops/lines_cop_spec.rb b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
index 1b23cca832..44f22df623 100644
--- a/Library/Homebrew/test/rubocops/lines_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
@@ -1165,6 +1165,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
       end
     end
 
+    it "with ARGV.include? (--HEAD)" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          test do
+            head = ARGV.include? "--HEAD"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Use \"if build.head?\" instead",
+                              severity: :convention,
+                              line: 5,
+                              column: 26,
+                              source: source }]
+
+      inspect_source(cop, source)
+
+      expected_offenses.zip(cop.offenses).each do |expected, actual|
+        expect_offense(expected, actual)
+      end
+    end
+
   end
   def expect_offense(expected, actual)
     expect(actual.message).to eq(expected[:message])