diff --git a/app/models/highlights_block.rb b/app/models/highlights_block.rb
index a8d455f..9ee66b7 100644
--- a/app/models/highlights_block.rb
+++ b/app/models/highlights_block.rb
@@ -12,7 +12,9 @@ class HighlightsBlock < Block
     block.images.each do |i|
       i[:image_id] = i[:image_id].to_i
       i[:position] = i[:position].to_i
-      i[:address] = Noosfero.root + i[:address]  unless Noosfero.root.nil?
+      if !Noosfero.root.nil? and !i[:address].start_with?(Noosfero.root + '/')
+        i[:address] = Noosfero.root + i[:address]
+      end
       begin
         file = UploadedFile.find(i[:image_id])
         i[:image_src] = file.public_filename
diff --git a/test/unit/highlights_block_test.rb b/test/unit/highlights_block_test.rb
index 533ec7d..1968eb2 100644
--- a/test/unit/highlights_block_test.rb
+++ b/test/unit/highlights_block_test.rb
@@ -132,6 +132,19 @@ class HighlightsBlockTest < ActiveSupport::TestCase
     assert_equal block.images.first[:address], "/social/address"
   end
 
+  should 'not duplicate sub-dir address before save' do
+    Noosfero.stubs(:root).returns("/social")
+    f1 = mock()
+    f1.expects(:public_filename).returns('address')
+    UploadedFile.expects(:find).with(1).returns(f1)
+    block = HighlightsBlock.new
+    i1 = {:image_id => 1, :address => '/social/address', :position => 3, :title => 'address'}
+    block.images = [i1]
+    block.save!
+    block.reload
+    assert_equal block.images.first[:address], "/social/address"
+  end
+
   should 'display images with subdir src' do
     Noosfero.stubs(:root).returns("/social")
     f1 = mock()
--
libgit2 0.21.2