Incompatible pointer types sending 'Class' to parameter of type 'id<UIActionSheetDelegate>'

I am receiving the warning Incompatible pointer types sending 'Class' to parameter of type 'id' in the line "delegate:self" below:

    + (SHKActionSheet *)actionSheetForType:(SHKShareType)type
{
    SHKActionSheet *as = [[SHKActionSheet alloc] initWithTitle:SHKLocalizedString(@"Share")
                                                      delegate:self
                                             cancelButtonTitle:nil
                                        destructiveButtonTitle:nil
                                             otherButtonTitles:nil];
    as.item = [[[SHKItem alloc] init] autorelease];
    as.item.shareType = type;

This warning is in ShareKit, if anyone knows how to fix it, please let me know!