@@ -14,10 +14,12 @@
  * file.
  */
 
 #import "OFException.h"
 
+OF_ASSUME_NONNULL_BEGIN
+
 @class OFSandbox;
 
 /*!
  * @class OFSandboxActivationFailedException \
  *	  OFSandboxActivationFailedException.h \
@@ -59,5 +61,7 @@
  * @return An initialized sandboxing failed exception
  */
 - initWithSandbox: (OFSandbox*)sandbox
 	    errNo: (int)errNo;
 @end
+
+OF_ASSUME_NONNULL_END