SSL/TLS: How to fix "Chain issues: Contains anchor"

I just ran a quick test at ssllabs.com: got A+, which I'm happy about.

However there's one thing I don't know how to "fix": My site supports OCSP stapling and ssllabs keeps telling me: Chain issues: Contains anchor. I know this is just a "warning" in the sense that it slows down the connection a bit.

nginx config:

..
ssl_certificate             public.crt;
ssl_certificate_key         private.key;
ssl_stapling                on;
ssl_stapling_verify         on;
ssl_trusted_certificate     my-chain.pem;
..

Where:

- public.crt is the public certificate I got from StartSSL

- private.key the certificate's private key

- my-chain.pem (ssllabs calls this: "Additional Certificates (if supplied)") consist of:

1.) StartCom Class 1 Primary Intermediate Server CA  
2.) StartCom Certification Authority

I found a site which also uses StartCom (StartSSL) certificates, supports OCSP stapling, but does not have the issue described above.

This site's "Additional Certificates":

1.) StartCom Class 1 Primary Intermediate Server CA

I've tried the same: Only put "StartCom Class 1 Primary Intermediate Server CA" to my-chain.pem.

However then ssllabs says: OCSP stapling: No So this seems to completely break OSCP stapling.

Any idea?