@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFHashAlreadyCalculatedException \
  *	  OFHashAlreadyCalculatedException.h \
  *	  ObjFW/OFHashAlreadyCalculatedException.h
  *
@@ -47,5 +49,7 @@
  * @param object The hash which has already been calculated
  * @return An initialized hash already calculated exception
  */
 - initWithObject: (id)object;
 @end
+
+OF_ASSUME_NONNULL_END