diff --git a/kit/Kit.cpp b/kit/Kit.cpp
index ec805039e..4ba312fca 100644
--- a/kit/Kit.cpp
+++ b/kit/Kit.cpp
@@ -630,7 +630,7 @@ public:
             return false;
         }
 
-        _websocketHandler->sendMessage(data, size, code);
+        _websocketHandler->sendMessage(data, size, code, /*flush=*/true);
         return true;
     }
 
diff --git a/net/WebSocketHandler.hpp b/net/WebSocketHandler.hpp
index 3d44280ca..481bad6bd 100644
--- a/net/WebSocketHandler.hpp
+++ b/net/WebSocketHandler.hpp
@@ -627,8 +627,8 @@ public:
 
     /// Sends a WebSocket message of WPOpCode type.
     /// Returns the number of bytes written (including frame overhead) on success,
-    /// 0 for closed/invalid socket, and -1 for other errors.
-    int sendMessage(const char* data, const size_t len, const WSOpCode code, const bool flush = true) const
+    /// 0 for closed socket, and -1 for other errors.
+    int sendMessage(const char* data, const size_t len, const WSOpCode code, const bool flush) const
     {
         int unitReturn = -1;
         if (!Util::isFuzzing() && UnitBase::get().filterSendMessage(data, len, code, flush, unitReturn))