diff --git a/openlp/core/ui/amendthemeform.py b/openlp/core/ui/amendthemeform.py
index 652b26284..b3a1d49e7 100644
--- a/openlp/core/ui/amendthemeform.py
+++ b/openlp/core/ui/amendthemeform.py
@@ -193,7 +193,7 @@ class AmendThemeForm(QtGui.QDialog, Ui_AmendThemeDialog):
 
     def onImageToolButtonClicked(self):
         filename = QtGui.QFileDialog.getOpenFileName(
-            self, self.trUtf8('Open file'))
+            self, self.trUtf8(u'Open file'))
         if filename:
             self.ImageLineEdit.setText(filename)
             self.theme.background_filename = filename