diff --git a/src/gen/constfunc.py b/src/gen/constfunc.py
index 10a2ad4ca..cfdc5ff27 100644
--- a/src/gen/constfunc.py
+++ b/src/gen/constfunc.py
@@ -94,7 +94,7 @@ def is_quartz():
             from gi.repository import Gdk
         except:
             return False
-        return Gdk.WINDOWING == "quartz"
+        return Gdk.Display.get_default().__class__.__name__.endswith("quartzDisplay")
     return False
 
 def has_display():