@@ -16,14 +16,13 @@
 #include "config.h"
 
 #import "OFCharacterSet.h"
 #import "OFBitSetCharacterSet.h"
 #import "OFInvertedCharacterSet.h"
+#import "OFOnce.h"
 #import "OFRangeCharacterSet.h"
 
-#import "once.h"
-
 @interface OFPlaceholderCharacterSet: OFCharacterSet
 @end
 
 @interface OFWhitespaceCharacterSet: OFCharacterSet
 @end