Any one tried decrypting ssl traffic between client and Charles Proxy?

I know that with Charles Proxy (and Fiddler) I can see the decrypted ssl traffic, but I also want to see it in Wireshark.

I'm certain that I capture the traffic on the right channel (between my client and Charles Proxy), and pretty sure I got Charles Proxy's private encryption key. But, I am not able to decrypt the traffic.

Any one else tried such a feat?