diff --git a/SoObjects/SOGo/SOGoObject.h b/SoObjects/SOGo/SOGoObject.h
index ee0fd9111..cde474b77 100644
--- a/SoObjects/SOGo/SOGoObject.h
+++ b/SoObjects/SOGo/SOGoObject.h
@@ -56,6 +56,7 @@
 
 - (NSTimeZone *) serverTimeZone;
 - (NSTimeZone *) userTimeZone;
+- (NSTimeZone *) userTimeZone: (NSString *) username;
 
 /* ownership */