@@ -17,10 +17,12 @@
 #import "OFObject.h"
 #import "OFSerialization.h"
 #import "OFJSONRepresentation.h"
 #import "OFMessagePackRepresentation.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFNull OFNull.h ObjFW/OFNull.h
  *
  * @brief A class for representing null values in collections.
  */
@@ -31,5 +33,7 @@
  *
  * @return An OFNull singleton
  */
 + (OFNull*)null;
 @end
+
+OF_ASSUME_NONNULL_END