@@ -26,10 +26,12 @@
 #import "OFObject.h"
 #import "OFSerialization.h"
 #import "OFJSONRepresentation.h"
 #import "OFMessagePackRepresentation.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 /*! @file */
 
 /*!
  * @brief The C type of a number stored in an OFNumber.
  */
@@ -811,10 +813,12 @@
  *
  * @return The OFNumber as a double
  */
 - (double)doubleValue;
 @end
+
+OF_ASSUME_NONNULL_END
 
 #ifndef NSINTEGER_DEFINED
 /* Required for number literals to work */
 @compatibility_alias NSNumber OFNumber;
 #endif