@@ -15,10 +15,12 @@
  */
 
 #import "OFObject.h"
 #import "OFSerialization.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*!
  * @class OFXMLNode OFXMLNode.h ObjFW/OFXMLNode.h
  *
  * @brief A class which stores an XML element.
  */
@@ -95,5 +97,7 @@
  *	   indentation
  */
 - (OFString*)XMLStringWithIndentation: (unsigned int)indentation
 				level: (unsigned int)level;
 @end
+
+OF_ASSUME_NONNULL_END