Index: src/OFMutableURL.m
==================================================================
--- src/OFMutableURL.m
+++ src/OFMutableURL.m
@@ -16,10 +16,11 @@
 
 #include "config.h"
 
 #import "OFMutableURL.h"
 #import "OFURL+Private.h"
+#import "OFString.h"
 
 @implementation OFMutableURL
 @dynamic scheme, host, port, user, password, path, parameters, query, fragment;
 
 + (instancetype)URL