diff --git a/src/signalo/core/tests.py b/src/signalo/core/tests.py
index c094198b..28ead615 100644
--- a/src/signalo/core/tests.py
+++ b/src/signalo/core/tests.py
@@ -4,6 +4,7 @@
 import os
 import pstats
 from itertools import islice
+from operator import itemgetter
 from typing import Callable, Iterable, Tuple
 
 import fiona
@@ -227,8 +228,12 @@ def test_flatgeobuf(self):
             set(json_coordinates),
             msg="The two sources map to the same set of coordinates.",
         )
+
+        fgb_coordinates.sort(key=itemgetter(0, 1))
+        json_coordinates.sort(key=itemgetter(0, 1))
+
         self.assertEqual(
             fgb_coordinates,
             json_coordinates,
-            msg="The two sources map to the same list of coordinates.",
+            msg="Once sorted, the two sources map to the same list of coordinates.",
         )