diff --git a/Lib/tkinter/test/test_tkinter/test_geometry_managers.py b/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
index c89bc8dbf85759..0c31e3661269fa 100644
--- a/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
+++ b/Lib/tkinter/test/test_tkinter/test_geometry_managers.py
@@ -108,8 +108,8 @@ def test_pack_configure_in(self):
         a.pack_configure(in_=c)
         self.assertEqual(pack.pack_slaves(), [b, c, d])
         self.assertEqual(c.pack_slaves(), [a])
-        with self.assertRaisesRegex(TclError,
-                                    'can\'t pack %s inside itself' % (a,)):
+        with self.assertRaisesRegex(
+                TclError, """can't pack "?%s"? inside itself""" % (a,)):
             a.pack_configure(in_=a)
         with self.assertRaisesRegex(TclError, 'bad window path name ".foo"'):
             a.pack_configure(in_='.foo')
@@ -292,8 +292,10 @@ def create2(self):
     def test_place_configure_in(self):
         t, f, f2 = self.create2()
         self.assertEqual(f2.winfo_manager(), '')
-        with self.assertRaisesRegex(TclError, "can't place %s relative to "
-                                    "itself" % re.escape(str(f2))):
+        with self.assertRaisesRegex(
+                TclError,
+                """can't place "?%s"? relative to itself"""
+                 % re.escape(str(f2))):
             f2.place_configure(in_=f2)
         self.assertEqual(f2.winfo_manager(), '')
         with self.assertRaisesRegex(TclError, 'bad window path name'):
diff --git a/Misc/NEWS.d/next/Tests/2023-05-15-02-22-44.gh-issue-104494.Bkrbfn.rst b/Misc/NEWS.d/next/Tests/2023-05-15-02-22-44.gh-issue-104494.Bkrbfn.rst
new file mode 100644
index 00000000000000..a320c48428b58b
--- /dev/null
+++ b/Misc/NEWS.d/next/Tests/2023-05-15-02-22-44.gh-issue-104494.Bkrbfn.rst
@@ -0,0 +1,2 @@
+Update ``test_pack_configure_in`` and ``test_place_configure_in``
+for changes to error message formatting in Tk 8.7.