@@ -16,10 +16,11 @@
 
 #include "config.h"
 
 #import "OFHashAlreadyCalculatedException.h"
 #import "OFString.h"
+#import "OFHash.h"
 
 #import "OFNotImplementedException.h"
 
 @implementation OFHashAlreadyCalculatedException
 + newWithClass: (Class)class_