diff --git a/engineioxide/src/transport/ws.rs b/engineioxide/src/transport/ws.rs
index 490174dd..dc037d01 100644
--- a/engineioxide/src/transport/ws.rs
+++ b/engineioxide/src/transport/ws.rs
@@ -182,7 +182,11 @@ where
                 }
                 p => return Err(Error::BadPacket(p)),
             },
-            Message::Binary(data) => {
+            Message::Binary(mut data) => {
+                if socket.protocol == ProtocolVersion::V3 && !data.is_empty() {
+                    // The first byte is the message type, which we don't need.
+                    let _ = data.remove(0);
+                }
                 engine.handler.on_binary(data, socket.clone());
                 Ok(())
             }