@@ -30,10 +30,11 @@
 typedef struct {
 	struct sockaddr_storage address;
 	socklen_t length;
 } of_udp_socket_address_t;
 
+#ifdef OF_HAVE_BLOCKS
 /*!
  * @brief A block which is called when the host / port pair for the UDP socket
  *	  has been resolved.
  *
  * @param host The host that has been resolved
@@ -57,10 +58,11 @@
  * @return A bool whether the same block should be used for the next receive
  */
 typedef bool (^of_udp_socket_async_receive_block_t)(OFUDPSocket *socket,
     void *buffer, size_t length, of_udp_socket_address_t sender,
     OFException *exception);
+#endif
 
 /*!
  * @brief A class which provides functions to create and use UDP sockets.
  *
  * Addresses are of type @ref of_udp_socket_address_t. You can use @ref