diff --git a/pydantic/_internal/_std_types_schema.py b/pydantic/_internal/_std_types_schema.py
index 9305e0c0a6..4e332a0bad 100644
--- a/pydantic/_internal/_std_types_schema.py
+++ b/pydantic/_internal/_std_types_schema.py
@@ -444,6 +444,7 @@ def infer_default() -> Callable[[], Any]:
             list: list,
             typing.Sequence: list,
             typing.Set: set,
+            set: set,
             typing.MutableSet: set,
             collections.abc.MutableSet: set,
             collections.abc.Set: frozenset,
diff --git a/tests/test_types.py b/tests/test_types.py
index 1923d925a6..0443763c62 100644
--- a/tests/test_types.py
+++ b/tests/test_types.py
@@ -4977,12 +4977,15 @@ def test_defaultdict_infer_default_factory() -> None:
     class Model(BaseModel):
         a: DefaultDict[int, List[int]]
         b: DefaultDict[int, int]
+        c: DefaultDict[int, set]
 
-    m = Model(a={}, b={})
+    m = Model(a={}, b={}, c={})
     assert m.a.default_factory is not None
     assert m.a.default_factory() == []
     assert m.b.default_factory is not None
     assert m.b.default_factory() == 0
+    assert m.c.default_factory is not None
+    assert m.c.default_factory() == set()
 
 
 def test_defaultdict_explicit_default_factory() -> None: