@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFNotOpenException OFNotOpenException.h ObjFW/OFNotOpenException.h
  *
  * @brief An exception indicating an object is not open, connected or bound.
  */
@@ -45,5 +47,7 @@
  * @param object The object which is not open, connected or bound
  * @return An initialized not open exception
  */
 - initWithObject: (id)object;
 @end
+
+OF_ASSUME_NONNULL_END