diff --git a/SocketIO-MacTests/SocketSideEffectTest.swift b/SocketIO-MacTests/SocketSideEffectTest.swift
index e010ae4..5d7aae3 100644
--- a/SocketIO-MacTests/SocketSideEffectTest.swift
+++ b/SocketIO-MacTests/SocketSideEffectTest.swift
@@ -66,7 +66,7 @@ class SocketSideEffectTest: XCTestCase {
             }
         }
         
-        socket.parseSocketMessage("2[\"test\",{\"test\":{\"_placeholder\":true,\"num\":0}}]")
+        socket.parseSocketMessage("51-[\"test\",{\"test\":{\"_placeholder\":true,\"num\":0}}]")
         socket.parseBinaryData(data)
         waitForExpectationsWithTimeout(3, handler: nil)
     }