diff --git a/src/util.rs b/src/util.rs
index 3b451bd5..ba011c1a 100644
--- a/src/util.rs
+++ b/src/util.rs
@@ -125,7 +125,20 @@ macro_rules! str_hash {
     };
 }
 
-#[cfg(Py_3_10)]
+#[cfg(Py_3_12)]
+macro_rules! pydict_contains {
+    ($obj1:expr, $obj2:expr) => {
+        unsafe {
+            pyo3_ffi::_PyDict_Contains_KnownHash(
+                pyo3_ffi::PyType_GetDict($obj1),
+                $obj2,
+                (*$obj2.cast::<pyo3_ffi::PyASCIIObject>()).hash,
+            ) == 1
+        }
+    };
+}
+
+#[cfg(all(Py_3_10, not(Py_3_12)))]
 macro_rules! pydict_contains {
     ($obj1:expr, $obj2:expr) => {
         unsafe {
diff --git a/test/test_default.py b/test/test_default.py
index d1e95587..547fce8c 100644
--- a/test/test_default.py
+++ b/test/test_default.py
@@ -275,3 +275,15 @@ def default(obj):
             orjson.dumps(ref, default=default)
 
         assert sys.getrefcount(ref) == 2  # one for ref, one for default
+
+    def test_default_set(self):
+        """
+        dumps() default function with set
+        """
+
+        def default(obj):
+            if isinstance(obj, set):
+                return list(obj)
+            raise TypeError
+
+        assert orjson.dumps({1, 2}, default=default) == b"[1,2]"