diff --git a/system_files/deck/shared/usr/libexec/os-branch-select b/system_files/deck/shared/usr/libexec/os-branch-select
index 5843481b..6ba85dbd 100755
--- a/system_files/deck/shared/usr/libexec/os-branch-select
+++ b/system_files/deck/shared/usr/libexec/os-branch-select
@@ -22,6 +22,7 @@ if [[ $# -eq 1 ]]; then
         "unstable")
           echo main
           exit 0
+          ;;
         *)
           # This can happen on CI builds or when downgrading from a newer build that knows of more branches.  The update
           # path should decide how to handle it.