diff --git a/SoObjects/SOGo/SOGoFolder.h b/SoObjects/SOGo/SOGoFolder.h
index a6aaf18d6..f4263b69b 100644
--- a/SoObjects/SOGo/SOGoFolder.h
+++ b/SoObjects/SOGo/SOGoFolder.h
@@ -68,6 +68,8 @@
 
 - (NSString *) outlookFolderClass;
 
+- (BOOL) folderIsMandatory;
+
 - (BOOL) create;
 - (NSException *) delete;