diff --git a/model_utils/tracker.py b/model_utils/tracker.py
index 6f50d10..5c7c7d8 100644
--- a/model_utils/tracker.py
+++ b/model_utils/tracker.py
@@ -210,7 +210,6 @@ class FieldTracker(object):
     def contribute_to_class(self, cls, name):
         self.name = name
         self.attname = '_%s' % name
-        self.patch_save(cls)
         models.signals.class_prepared.connect(self.finalize_class, sender=cls)
 
     def finalize_class(self, sender, **kwargs):
@@ -227,6 +226,7 @@ class FieldTracker(object):
         models.signals.post_init.connect(self.initialize_tracker)
         self.model_class = sender
         setattr(sender, self.name, self)
+        self.patch_save(sender)
 
     def initialize_tracker(self, sender, instance, **kwargs):
         if not isinstance(instance, self.model_class):
diff --git a/tests/models.py b/tests/models.py
index ef38626..bab9d4b 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -238,6 +238,10 @@ class Tracked(models.Model):
 
     tracker = FieldTracker()
 
+    def save(self, *args, **kwargs):
+        """ No-op save() to ensure that FieldTracker.patch_save() works. """
+        super(Tracked, self).save(*args, **kwargs)
+
 
 class TrackedFK(models.Model):
     fk = models.ForeignKey('Tracked', on_delete=models.CASCADE)