@@ -556,10 +556,13 @@
 - (int)fileDescriptorForReading
 {
 #ifndef _WIN32
 	return _socket;
 #else
+	if (_socket == INVALID_SOCKET)
+		return -1;
+
 	if (_socket > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	return (int)_socket;
 #endif
@@ -568,10 +571,13 @@
 - (int)fileDescriptorForWriting
 {
 #ifndef _WIN32
 	return _socket;
 #else
+	if (_socket == INVALID_SOCKET)
+		return -1;
+
 	if (_socket > INT_MAX)
 		@throw [OFOutOfRangeException exception];
 
 	return (int)_socket;
 #endif