diff --git a/CHANGES/1677.misc.rst b/CHANGES/1677.misc.rst
new file mode 100644
index 00000000..ce0de8c1
--- /dev/null
+++ b/CHANGES/1677.misc.rst
@@ -0,0 +1,5 @@
+Fixed MyPy [return-value] error in `InlineKeyboardBuilder().as_markup()`.
+`as_markup` method now overloads parent class method and uses `super()`, to call parent's 
+`as_markup` method.
+Also added correct type hint to `as_markup`'s return in `InlineKeyboardBuilder` and 
+`ReplyKeyboardBuilder` classes.
diff --git a/aiogram/utils/keyboard.py b/aiogram/utils/keyboard.py
index fe806f7a..8caa02b5 100644
--- a/aiogram/utils/keyboard.py
+++ b/aiogram/utils/keyboard.py
@@ -336,11 +336,9 @@ class InlineKeyboardBuilder(KeyboardBuilder[InlineKeyboardButton]):
             ),
         )
 
-    if TYPE_CHECKING:
-
-        def as_markup(self, **kwargs: Any) -> InlineKeyboardMarkup:
-            """Construct an InlineKeyboardMarkup"""
-            ...
+    def as_markup(self, **kwargs: Any) -> InlineKeyboardMarkup:
+        """Construct an InlineKeyboardMarkup"""
+        return cast(InlineKeyboardMarkup, super().as_markup(**kwargs))
 
     def __init__(self, markup: Optional[List[List[InlineKeyboardButton]]] = None) -> None:
         super().__init__(button_type=InlineKeyboardButton, markup=markup)
@@ -401,9 +399,9 @@ class ReplyKeyboardBuilder(KeyboardBuilder[KeyboardButton]):
             ),
         )
 
-    if TYPE_CHECKING:
-
-        def as_markup(self, **kwargs: Any) -> ReplyKeyboardMarkup: ...
+    def as_markup(self, **kwargs: Any) -> ReplyKeyboardMarkup:
+        """Construct a ReplyKeyboardMarkup"""
+        return cast(ReplyKeyboardMarkup, super().as_markup(**kwargs))
 
     def __init__(self, markup: Optional[List[List[KeyboardButton]]] = None) -> None:
         super().__init__(button_type=KeyboardButton, markup=markup)