diff --git a/SoObjects/SOGo/SOGoUserFolder.m b/SoObjects/SOGo/SOGoUserFolder.m
index 862525153..4294e50b8 100644
--- a/SoObjects/SOGo/SOGoUserFolder.m
+++ b/SoObjects/SOGo/SOGoUserFolder.m
@@ -22,6 +22,7 @@
 
 #import <Foundation/NSArray.h>
 #import <Foundation/NSEnumerator.h>
+#import <Foundation/NSNull.h>
 #import <Foundation/NSString.h>
 #import <Foundation/NSURL.h>