diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index f6c1ab4..f40a553 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -255,7 +255,7 @@
     def get(self):
         """Return value of variable as string."""
         value = self._tk.globalgetvar(self._name)
-        if isinstance(value, basestring):
+        if isinstance(value, str):
             return value
         return str(value)