diff --git a/django/contrib/auth/hashers.py b/django/contrib/auth/hashers.py
index 0188f4a4e7..3d585be5cc 100644
--- a/django/contrib/auth/hashers.py
+++ b/django/contrib/auth/hashers.py
@@ -286,7 +286,7 @@ class BCryptSHA256PasswordHasher(BasePasswordHasher):
 
     def salt(self):
         bcrypt = self._load_library()
-        return bcrypt.gensalt(self.rounds)
+        return bcrypt.gensalt(rounds=self.rounds)
 
     def encode(self, password, salt):
         bcrypt = self._load_library()