diff --git a/gramps/gen/lib/styledtext.py b/gramps/gen/lib/styledtext.py
index 0dc2f087e..0b6800f1d 100644
--- a/gramps/gen/lib/styledtext.py
+++ b/gramps/gen/lib/styledtext.py
@@ -299,6 +299,7 @@ class StyledText:
         """
         if self._tags:
             the_tags = [tag.serialize() for tag in self._tags]
+            the_tags.sort()
         else:
             the_tags = []
 
diff --git a/gramps/gen/lib/test/styledtext_test.py b/gramps/gen/lib/test/styledtext_test.py
index 0d0485f74..cb17b4c4b 100644
--- a/gramps/gen/lib/test/styledtext_test.py
+++ b/gramps/gen/lib/test/styledtext_test.py
@@ -64,11 +64,11 @@ class Test1(unittest.TestCase):
         C = self.C.join([self.A, self.S, deepcopy(self.B)])
         C = C.replace('X', StyledText('_', [self.T3]))
         _C = ('123_456\ncleartext\nabc_def',
-              [((1, ''), 'v1', [(0, 2), (2, 3)]),
-               ((0, ''), 'v3', [(3, 4)]),
+              [((0, ''), 'v3', [(3, 4)]),
+               ((0, ''), 'v3', [(21, 22)]),
+               ((1, ''), 'v1', [(0, 2), (2, 3)]),
                ((1, ''), 'v1', [(4, 6)]),
                ((2, ''), 'v2', [(19, 21), (18, 21)]),
-               ((0, ''), 'v3', [(21, 22)]),
                ((2, ''), 'v2', [(22, 23), (22, 25)])])
         self.assertEqual(C.serialize(), _C)