@@ -15,10 +15,12 @@
  */
 
 #import "OFObject.h"
 #import "OFSerialization.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @class OFString;
 @class OFConstantString;
 
 /*!
  * @class OFDate OFDate.h ObjFW/OFDate.h
@@ -336,5 +338,7 @@
  * @param seconds The seconds after the date
  * @return A new, autoreleased OFDate
  */
 - (OFDate*)dateByAddingTimeInterval: (of_time_interval_t)seconds;
 @end
+
+OF_ASSUME_NONNULL_END