diff --git a/source/mijin/net/socket.hpp b/source/mijin/net/socket.hpp
index 45bb315..2f8a87e 100644
--- a/source/mijin/net/socket.hpp
+++ b/source/mijin/net/socket.hpp
@@ -105,7 +105,7 @@ public:
         return StreamError::UNKNOWN_ERROR;
     }
     void close() MIJIN_NOEXCEPT;
-    [[nodiscard]] bool isListening() const MIJIN_NOEXCEPT { return handle_ >= 0; }
+    [[nodiscard]] bool isListening() const MIJIN_NOEXCEPT { return handle_ != INVALID_SOCKET_HANDLE; }
 
     Task<StreamResult<std::unique_ptr<TCPSocket>>> c_waitForConnection() MIJIN_NOEXCEPT;
 };