@@ -14,13 +14,17 @@
  * file.
  */
 
 #import "OFReadOrWriteFailedException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFWriteFailedException \
  *	  OFWriteFailedException.h ObjFW/OFWriteFailedException.h
  *
  * @brief An exception indicating that writing to an object failed.
  */
 @interface OFWriteFailedException: OFReadOrWriteFailedException
 @end
+
+OF_ASSUME_NONNULL_END