diff --git a/matrix_appservice_kakaotalk/kt/types/chat/attachment/emoticon.py b/matrix_appservice_kakaotalk/kt/types/chat/attachment/emoticon.py
index 5a81518..d36d6ac 100644
--- a/matrix_appservice_kakaotalk/kt/types/chat/attachment/emoticon.py
+++ b/matrix_appservice_kakaotalk/kt/types/chat/attachment/emoticon.py
@@ -25,7 +25,7 @@ class EmoticonAttachment(Attachment):
     path: str
     name: str
     type: str
-    alt: str
+    alt: Optional[str] = None # NOTE Made optional
     s: Optional[int] = None
     sound: Optional[str] = None
     width: Optional[int] = None