diff --git a/tagulous/models/managers.py b/tagulous/models/managers.py
index 208615e..47aa5b4 100644
--- a/tagulous/models/managers.py
+++ b/tagulous/models/managers.py
@@ -57,15 +57,8 @@ def flush_cache(self):
 
         Must be called after all
         """
-        # Django 2.0 changes cache management
-        if hasattr(self.field, "get_cached_value"):
-            if self.field.is_cached(self.instance):
-                self.field.delete_cached_value(self.instance)
-        else:
-            # Django <2.0
-            cache_name = self.field.get_cache_name()
-            if hasattr(self.instance, cache_name):
-                delattr(self.instance, cache_name)
+        if self.field.is_cached(self.instance):
+            self.field.delete_cached_value(self.instance)
 
     def get_actual(self):
         """