@@ -13,10 +13,12 @@
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
 #include "config.h"
+
+#define OF_STREAM_OBSERVER_M
 
 #include <string.h>
 
 #ifdef OF_HAVE_POLL
 # include <poll.h>