diff --git a/qchainagedialog.py b/qchainagedialog.py
index 9edd2c2..9f6ae47 100644
--- a/qchainagedialog.py
+++ b/qchainagedialog.py
@@ -123,4 +123,4 @@ def accept(self):
             divide,
             decimal)
         self.qgisSettings.setValue(projectionSettingKey, oldProjectionSetting)
-        QDialog.accept(self)
+        QtGui.QDialog.accept(self)