diff --git a/src/fobi/contrib/themes/bootstrap3/fobi_themes.py b/src/fobi/contrib/themes/bootstrap3/fobi_themes.py
index fffd1de5..06b92342 100644
--- a/src/fobi/contrib/themes/bootstrap3/fobi_themes.py
+++ b/src/fobi/contrib/themes/bootstrap3/fobi_themes.py
@@ -103,5 +103,8 @@ class Bootstrap3Theme(BaseTheme):
     form_importer_template = 'bootstrap3/form_importer.html'
     form_importer_ajax_template = 'bootstrap3/form_importer_ajax.html'
 
+    def __init__(self, user=None):
+        super(Bootstrap3Theme, self).__init__(user=user)
+        self.form_radio_element_html_class = ''
 
 theme_registry.register(Bootstrap3Theme)