diff --git a/django/contrib/admin/decorators.py b/django/contrib/admin/decorators.py
index cc6943dbdd..5862bb5536 100644
--- a/django/contrib/admin/decorators.py
+++ b/django/contrib/admin/decorators.py
@@ -20,7 +20,7 @@ def register(*models, **kwargs):
             raise ValueError('site must subclass AdminSite')
 
         if not issubclass(admin_class, ModelAdmin):
-            raise ValueError('Wrapped class must sublcass ModelAdmin.')
+            raise ValueError('Wrapped class must subclass ModelAdmin.')
 
         admin_site.register(models, admin_class=admin_class)
 
diff --git a/tests/admin_registration/tests.py b/tests/admin_registration/tests.py
index 994de3bdf7..e5947e0a93 100644
--- a/tests/admin_registration/tests.py
+++ b/tests/admin_registration/tests.py
@@ -115,7 +115,7 @@ class TestRegistrationDecorator(TestCase):
         )
 
     def test_wrapped_class_not_a_model_admin(self):
-        self.assertRaisesMessage(ValueError, 'Wrapped class must sublcass ModelAdmin.',
+        self.assertRaisesMessage(ValueError, 'Wrapped class must subclass ModelAdmin.',
             register(Person), CustomSite)
 
     def test_custom_site_not_an_admin_site(self):