diff --git a/test/edit.t b/test/edit.t
index 04ab8a9b7..f2523c454 100755
--- a/test/edit.t
+++ b/test/edit.t
@@ -86,7 +86,7 @@ class TestTaskEdit(TestCase):
     def test_command_line_modifications(self):
         """Verify that the 'edit' command does not accept command line modifications"""
         code, out, err = self.t.runError("1 edit +foo")
-        self.assertIn("Command line modifications are not support by this command.", err)
+        self.assertIn("Command line modifications are not supported by this command.", err)
 
 
 if __name__ == "__main__":
diff --git a/test/undo.t b/test/undo.t
index e25166355..a5fafb803 100755
--- a/test/undo.t
+++ b/test/undo.t
@@ -65,7 +65,7 @@ class TestUndo(TestCase):
         """Verify that en-passant changes during undo are an error"""
         self.t("add one")
         code, out, err = self.t.runError("undo +tag")
-        self.assertIn("The undo command does not allow further task modification.", err)
+        self.assertIn("Command line modifications are not supported by this command.", err)
 
 
 class TestBug634(TestCase):