@@ -22,12 +22,12 @@
 
 #import <ObjFW/ObjFW.h>
 
 @protocol PasswordGenerator
 @property size_t length;
-@property (copy) OFString *site;
+@property (nonatomic, copy) OFString *site;
 @property const char *passphrase;
 @property (readonly) unsigned char *output;
 
 + (instancetype)generator;
 - (void)derivePassword;
 @end