On 13 November 2008, Compper was called up by Germany for the first time. Five days later after being called up again, on 19 November 2008, Compper received his sole international cap in a friendly against England, making him the first Hoffenheim player to be capped by Germany. After the match, Compper reflected on his debut, saying: "I was very happy to play from the start, but my debut was only marred by the defeat, it's a shame we could not finish the year successfully."