Use the -b syntax for the branch name in Vcs-Git.

Author: jelmer

debian/control

@@ -6,7 +6,7 @@ Standards-Version: 3.9.8
 Build-Depends: debhelper (>= 9), cmake
 Homepage: https://github.com/Gregwar/fatcat
 Vcs-Browser: https://www.github.com/Gregwar/fatcat/tree/debian
-Vcs-Git: git://github.com/Gregwar/fatcat/tree/debian
+Vcs-Git: git://github.com/Gregwar/fatcat -b debian
 
 Package: fatcat
 Architecture: any