diff --git a/tests/functional/openlp_core_lib/test_renderer.py b/tests/functional/openlp_core_lib/test_renderer.py
index 85fb774e1..feaefcd4d 100644
--- a/tests/functional/openlp_core_lib/test_renderer.py
+++ b/tests/functional/openlp_core_lib/test_renderer.py
@@ -182,13 +182,15 @@ class TestRenderer(TestCase):
     @patch('openlp.core.lib.renderer.QtWebKitWidgets.QWebView')
     @patch('openlp.core.lib.renderer.build_lyrics_format_css')
     @patch('openlp.core.lib.renderer.build_lyrics_outline_css')
-    def test_set_text_rectangle(self, mock_outline_css, mock_lyrics_css, mock_webview):
+    @patch('openlp.core.lib.renderer.build_chords_css')
+    def test_set_text_rectangle(self, mock_build_chords_css, mock_outline_css, mock_lyrics_css, mock_webview):
         """
         Test set_text_rectangle returns a proper html string
         """
         # GIVEN: test object and data
         mock_lyrics_css.return_value = ' FORMAT CSS; '
         mock_outline_css.return_value = ' OUTLINE CSS; '
+        mock_build_chords_css.return_value = ' CHORDS CSS; '
         theme_data = Theme()
         theme_data.font_main_name = 'Arial'
         theme_data.font_main_size = 20