diff --git a/lib/rabl-fast-json/library.rb b/lib/rabl-fast-json/library.rb
index b7f6661..20fb6f2 100644
--- a/lib/rabl-fast-json/library.rb
+++ b/lib/rabl-fast-json/library.rb
@@ -23,6 +23,7 @@ module RablFastJson
     def get_compiled_template(path, source)
       if path && RablFastJson.cache_templates?
         @cached_templates[path] ||= Compiler.new.compile_source(source)
+        @cached_templates[path].dup
       else
         Compiler.new.compile_source(source)
       end
diff --git a/test/cache_templates_test.rb b/test/cache_templates_test.rb
index c9e01c2..5de4e56 100644
--- a/test/cache_templates_test.rb
+++ b/test/cache_templates_test.rb
@@ -10,8 +10,19 @@ class CacheTemplatesTest < ActiveSupport::TestCase
   test "cache templates if perform_caching is active and cache_templates is enabled" do
     RablFastJson.cache_templates = true
     ActionController::Base.stub(:perform_caching).and_return(true)    
+    @library.get_compiled_template('some/path', "")
+    t = @library.get_compiled_template('some/path', "attribute :id")
     
-    assert_equal @library.get_compiled_template('some/path', ""), @library.get_compiled_template('some/path', "")
+    assert_equal({}, t.source)
+  end
+  
+  test "cached templates should not be modifiable in place" do
+    RablFastJson.cache_templates = true
+    ActionController::Base.stub(:perform_caching).and_return(true)
+    t = @library.get_compiled_template('some/path', "")
+    assert_nil t.context
+    t.context = "foobar"
+    assert_nil @library.get_compiled_template('some/path', "").context
   end
   
   test "don't cache templates cache_templates is enabled but perform_caching is not active" do