@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFHash.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFSHA1Hash OFSHA1Hash.h ObjFW/OFSHA1Hash.h
  *
  * @brief A class which provides functions to create an SHA-1 hash.
  */
@@ -33,5 +35,7 @@
 	bool _calculated;
 }
 
 - (void)OF_resetState;
 @end
+
+OF_ASSUME_NONNULL_END