@@ -15,10 +15,12 @@
  */
 
 #import "OFObject.h"
 #import "OFMessagePackRepresentation.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @class OFDataArray;
 
 /*!
  * @class OFMessagePackExtension \
  *	  OFMessagePackExtension.h ObjFW/OFMessagePackExtension.h
@@ -71,5 +73,7 @@
  *
  * @return The data of the extension
  */
 - (OFDataArray*)data;
 @end
+
+OF_ASSUME_NONNULL_END