diff --git a/spec/docx/document_spec.rb b/spec/docx/document_spec.rb
index 28db70f..980327a 100755
--- a/spec/docx/document_spec.rb
+++ b/spec/docx/document_spec.rb
@@ -522,4 +522,13 @@
     end
   end
 
+  describe '#to_html' do
+    before do
+      @doc = Docx::Document.open(@fixtures_path + '/internal-links.docx')
+    end
+
+    it 'should not raise error' do
+      expect { @doc.to_html }.to_not raise_error
+    end
+  end
 end
diff --git a/spec/fixtures/internal-links.docx b/spec/fixtures/internal-links.docx
new file mode 100644
index 0000000..31a7153
Binary files /dev/null and b/spec/fixtures/internal-links.docx differ