diff --git a/tracker/models/event.py b/tracker/models/event.py
index ceb1b9ed0..a4d8afb21 100644
--- a/tracker/models/event.py
+++ b/tracker/models/event.py
@@ -21,6 +21,19 @@
 from .fields import TimestampField
 from .util import LatestEvent
 
+# TODO: remove when 3.10 is oldest supported version
+
+try:
+    from itertools import pairwise
+except ImportError:
+
+    def pairwise(iterable):
+        # pairwise('ABCDEFG') --> AB BC CD DE EF FG
+        a, b = itertools.tee(iterable)
+        next(b, None)
+        return zip(a, b)
+
+
 __all__ = [
     'Event',
     'PostbackURL',
@@ -547,7 +560,7 @@ def clean(self):
                             'order': 'Next anchor in the order would occur before this one'
                         }
                     )
-                for c, n in itertools.pairwise(
+                for c, n in pairwise(
                     itertools.chain(
                         [self],
                         SpeedRun.objects.filter(