diff --git a/aiogram/filters/callback_data.py b/aiogram/filters/callback_data.py
index 7a09dedb..fde39761 100644
--- a/aiogram/filters/callback_data.py
+++ b/aiogram/filters/callback_data.py
@@ -120,9 +120,8 @@ class CallbackData(BaseModel):
             raise ValueError(f"Bad prefix ({prefix!r} != {cls.__prefix__!r})")
         payload = {}
         for k, v in zip(names, parts):  # type: str, Optional[str]
-            if field := cls.model_fields.get(k):
-                if v == "" and not field.is_required():
-                    v = None
+            if v == "":
+                v = None
             payload[k] = v
         return cls(**payload)
 
diff --git a/tests/test_filters/test_callback_data.py b/tests/test_filters/test_callback_data.py
index e8721a41..e52e66b2 100644
--- a/tests/test_filters/test_callback_data.py
+++ b/tests/test_filters/test_callback_data.py
@@ -147,6 +147,15 @@ class TestCallbackData:
         assert MyCallback3.unpack("test3:experiment:42") == MyCallback3(bar=42)
         assert MyCallback3.unpack("test3:spam:42") == MyCallback3(foo="spam", bar=42)
 
+    def test_unpack_optional_wo_default(self):
+        """Test CallbackData without default optional."""
+
+        class TgData(CallbackData, prefix="tg"):
+            chat_id: int
+            thread_id: Optional[int]
+
+        assert TgData.unpack("tg:123:") == TgData(chat_id=123, thread_id=None)
+
     def test_build_filter(self):
         filter_object = MyCallback.filter(F.foo == "test")
         assert isinstance(filter_object.rule, MagicFilter)