diff --git a/av/data/stream.pyi b/av/data/stream.pyi
index f84e5f9c2..a416da7e3 100644
--- a/av/data/stream.pyi
+++ b/av/data/stream.pyi
@@ -3,5 +3,7 @@ from av.packet import Packet
 from av.stream import Stream
 
 class DataStream(Stream):
+    type = "data"
+
     def encode(self, frame: Frame | None = None) -> list[Packet]: ...
     def decode(self, packet: Packet | None = None, count: int = 0) -> list[Frame]: ...