Adding a band's single to the full album on iTunes

I purchased the Blink 182 song for their single "Edging" some time ago. I then just purchase the rest of the album One More Time and all the rest of the songs in the album. I noticed that when I purchased the album that iTunes already indicated that I have previously purchased the song "Edging" already, so I didn't have to purchase it again.

Now I notice that the song is not included in my album when I go to listen to it, and the track listing skips over Track #9 (which is the song "Edging"). How can I get the single song that I have on my phone onto the album so I can listen to it when I go to listen to the entire album?