@@ -16,10 +16,12 @@
 
 #import "OFObject.h"
 #ifdef OF_HAVE_SOCKETS
 # import "OFTCPSocket.h"
 #endif
+
+OF_ASSUME_NONNULL_BEGIN
 
 @class OFSortedList OF_GENERIC(ObjectType);
 #ifdef OF_HAVE_THREADS
 @class OFMutex;
 @class OFCondition;
@@ -80,5 +82,7 @@
  * @brief Stops the run loop. If there is still an operation being executed, it
  *	  is finished before the run loop stops.
  */
 - (void)stop;
 @end
+
+OF_ASSUME_NONNULL_END