diff --git a/gramps/gui/viewmanager.py b/gramps/gui/viewmanager.py
index 7997ee9e6..cb6e83842 100644
--- a/gramps/gui/viewmanager.py
+++ b/gramps/gui/viewmanager.py
@@ -101,6 +101,7 @@ from .managedwindow import ManagedWindow
 #-------------------------------------------------------------------------
 if is_quartz():
     try:
+        gi.require_version('GtkosApplication', '1.0')
         from gi.repository import GtkosxApplication as QuartzApp
         _GTKOSXAPPLICATION = True
     except: