diff --git a/sortedm2m_tests/compat.py b/sortedm2m_tests/compat.py
deleted file mode 100644
index 49c93c6..0000000
--- a/sortedm2m_tests/compat.py
+++ /dev/null
@@ -1,2 +0,0 @@
-def m2m_set(instance, field_name, objs):
-    getattr(instance, field_name).set(objs)
diff --git a/sortedm2m_tests/test_field.py b/sortedm2m_tests/test_field.py
index 2920c34..c485090 100644
--- a/sortedm2m_tests/test_field.py
+++ b/sortedm2m_tests/test_field.py
@@ -10,7 +10,6 @@
 from sortedm2m.compat import get_field, get_rel
 from sortedm2m.fields import SORT_VALUE_FIELD_NAME
 
-from .compat import m2m_set
 from .models import Book, DoItYourselfShelf, SelfReference, Shelf, Store, TaggedDoItYourselfShelf
 
 
@@ -80,24 +79,24 @@ def test_set_items(self):
         self.assertEqual(list(shelf.books.all()), [])
 
         books = self.books[5:2:-1]
-        m2m_set(shelf, "books", books)
+        shelf.books.set(books)
         self.assertEqual(list(shelf.books.all()), books)
 
         books.reverse()
-        m2m_set(shelf, "books", books)
+        shelf.books.set(books)
         self.assertEqual(list(shelf.books.all()), books)
 
         shelf.books.add(self.books[8])
         self.assertEqual(list(shelf.books.all()), books + [self.books[8]])
 
-        m2m_set(shelf, "books", [])
+        shelf.books.set([])
         self.assertEqual(list(shelf.books.all()), [])
 
-        m2m_set(shelf, "books", [self.books[9]])
+        shelf.books.set([self.books[9]])
         self.assertEqual(list(shelf.books.all()), [
             self.books[9]])
 
-        m2m_set(shelf, "books", [])
+        shelf.books.set([])
         self.assertEqual(list(shelf.books.all()), [])
 
     def test_set_items_by_pk(self):
@@ -105,20 +104,20 @@ def test_set_items_by_pk(self):
         self.assertEqual(list(shelf.books.all()), [])
 
         books = self.books[5:2:-1]
-        m2m_set(shelf, "books", [b.pk for b in books])
+        shelf.books.set([b.pk for b in books])
         self.assertEqual(list(shelf.books.all()), books)
 
-        m2m_set(shelf, "books", [self.books[5].pk, self.books[2]])
+        shelf.books.set([self.books[5].pk, self.books[2]])
         self.assertEqual(list(shelf.books.all()), [
             self.books[5],
             self.books[2]])
 
-        m2m_set(shelf, "books", [force_str(self.books[8].pk)])
+        shelf.books.set([force_str(self.books[8].pk)])
         self.assertEqual(list(shelf.books.all()), [self.books[8]])
 
     def test_remove_items(self):
         shelf = self.model.objects.create()
-        m2m_set(shelf, "books", self.books[2:5])
+        shelf.books.set(self.books[2:5])
         self.assertEqual(list(shelf.books.all()), [
             self.books[2],
             self.books[3],
@@ -134,7 +133,7 @@ def test_remove_items(self):
 
     def test_remove_items_by_pk(self):
         shelf = self.model.objects.create()
-        m2m_set(shelf, "books", self.books[2:5])
+        shelf.books.set(self.books[2:5])
         self.assertEqual(list(shelf.books.all()), [
             self.books[2],
             self.books[3],
@@ -175,7 +174,7 @@ def test_prefetch_related_queries_num(self):
     def test_prefetch_related_sorting(self):
         shelf = self.model.objects.create()
         books = [self.books[0], self.books[2], self.books[1]]
-        m2m_set(shelf, "books", books)
+        shelf.books.set(books)
 
         shelf = self.model.objects.filter(pk=shelf.pk).prefetch_related('books')[0]