@@ -158,11 +158,11 @@
  * @throw OFReadFailedException Receiving failed
  * @throw OFNotOpenException The socket is not open
  */
 - (size_t)receiveIntoBuffer: (void *)buffer
 		     length: (size_t)length
-		     sender: (OFSocketAddress *)sender;
+		     sender: (nullable OFSocketAddress *)sender;
 
 /**
  * @brief Asynchronously receives a datagram and stores it into the specified
  *	  buffer.
  *