@@ -13,10 +13,12 @@
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
 #import "OFException.h"
+
+OF_ASSUME_NONNULL_BEGIN
 
 @class OFKernelEventObserver;
 
 /*!
  * @class OFObserveFailedException \
@@ -58,5 +60,7 @@
  * @return An initialized observe failed exception
  */
 - initWithObserver: (OFKernelEventObserver*)observer
 	     errNo: (int)errNo;
 @end
+
+OF_ASSUME_NONNULL_END