diff --git a/aqt/preferences.py b/aqt/preferences.py
index 1fc4465cd..ff91469f5 100644
--- a/aqt/preferences.py
+++ b/aqt/preferences.py
@@ -18,6 +18,8 @@ class Preferences(QDialog):
         self.prof = self.mw.pm.profile
         self.form = aqt.forms.preferences.Ui_Preferences()
         self.form.setupUi(self)
+        self.form.buttonBox.button(QDialogButtonBox.Help).setAutoDefault(False)
+        self.form.buttonBox.button(QDialogButtonBox.Close).setAutoDefault(False)
         self.connect(self.form.buttonBox, SIGNAL("helpRequested()"),
                      lambda: openHelp("profileprefs"))
         self.setupCollection()