diff --git a/builders/windows-builder.py b/builders/windows-builder.py
index 057c2e3..574cb8c 100644
--- a/builders/windows-builder.py
+++ b/builders/windows-builder.py
@@ -165,7 +165,7 @@ class WindowsBuilder(Builder):
         self._print('Creating WiX file...')
         config_dir = os.path.dirname(self.config_path)
         self._print_verbose('Reading base WiX file')
-        with open(os.path.join(config_dir, 'OpenLP-base.wxs'), 'rb') as base_file:
+        with open(os.path.join(config_dir, 'OpenLP-base.wxs'), 'rt') as base_file:
             xml = base_file.read()
         xml = xml.format(dialog=os.path.join(config_dir, 'WizardMain.bmp'),
                          banner=os.path.join(config_dir, 'WizardBanner.bmp'))