diff --git a/Library/Homebrew/rubocops/lines_cop.rb b/Library/Homebrew/rubocops/lines_cop.rb
index b6567466ac..dac5234244 100644
--- a/Library/Homebrew/rubocops/lines_cop.rb
+++ b/Library/Homebrew/rubocops/lines_cop.rb
@@ -314,12 +314,12 @@ module RuboCop
             next unless match = regex_match_group(arg, %r{with(out)?-(.*)})
             problem "Use build.with#{match[1]}? \"#{match[2]}\" instead of build.include? 'with#{match[1]}-#{match[2]}'"
           end
-          #
-          # find_instance_method_call(body_node, :build, :include?) do |m|
-          #   arg = parameters(m).first
-          #   next unless match = regex_match_group(arg, %r{\-\-(.*)})
-          #   problem "Reference '#{match[1]}' without dashes"
-          # end
+
+          find_instance_method_call(body_node, :build, :include?) do |m|
+            arg = parameters(m).first
+            next unless match = regex_match_group(arg, %r{\-\-(.*)})
+            problem "Reference '#{match[1]}' without dashes"
+          end
 
         end
 
diff --git a/Library/Homebrew/test/rubocops/lines_cop_spec.rb b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
index 36c6272b38..288ca8f8f0 100644
--- a/Library/Homebrew/test/rubocops/lines_cop_spec.rb
+++ b/Library/Homebrew/test/rubocops/lines_cop_spec.rb
@@ -787,6 +787,30 @@ describe RuboCop::Cop::FormulaAudit::Miscellaneous do
         expect_offense(expected, actual)
       end
     end
+
+    it "with build.include? with dashed args" do
+      source = <<-EOS.undent
+        class Foo < Formula
+          desc "foo"
+          url 'http://example.com/foo-1.0.tgz'
+          def post_install
+            return if build.include? "--bar"
+          end
+        end
+      EOS
+
+      expected_offenses = [{  message: "Reference 'bar' without dashes",
+                              severity: :convention,
+                              line: 5,
+                              column: 30,
+                              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])