diff --git a/spec/functions/concat_spec.rb b/spec/functions/concat_spec.rb
index b853b4c1a..49cb2ad7f 100755
--- a/spec/functions/concat_spec.rb
+++ b/spec/functions/concat_spec.rb
@@ -27,4 +27,9 @@
     expect(result).to(eq(['1','2','3',['4','5'],'6']))
   end
 
+  it "should leave the original array intact" do
+    array_original = ['1','2','3']
+    result = scope.function_concat([array_original,['4','5','6']])
+    array_original.should(eq(['1','2','3']))
+  end
 end