diff --git a/UI/PreferencesUI/UIxPreferences.m b/UI/PreferencesUI/UIxPreferences.m
index 45894f50b..63798b11d 100644
--- a/UI/PreferencesUI/UIxPreferences.m
+++ b/UI/PreferencesUI/UIxPreferences.m
@@ -28,6 +28,7 @@
 #import <NGObjWeb/WOContext.h>
 #import <NGObjWeb/WORequest.h>
 
+#import <NGImap4/NGSieveClient.h>
 #import <NGImap4/NSString+Imap4.h>
 
 #import <NGExtensions/NSObject+Logs.h>