@@ -13,10 +13,12 @@
  * LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
  * file.
  */
 
 #import "OFArray.h"
+
+OF_ASSUME_NONNULL_BEGIN
 
 @interface OFArray_subarray: OFArray
 {
 	OFArray *_array;
 	of_range_t _range;
@@ -25,5 +27,7 @@
 + (instancetype)arrayWithArray: (OFArray*)array
 			 range: (of_range_t)range;
 - initWithArray: (OFArray*)array
 	  range: (of_range_t)range;
 @end
+
+OF_ASSUME_NONNULL_END