diff --git a/tools/tools/git/mfc-candidates.lua b/tools/tools/git/mfc-candidates.lua
--- a/tools/tools/git/mfc-candidates.lua
+++ b/tools/tools/git/mfc-candidates.lua
@@ -138,7 +138,10 @@
 		local qtr = math.ceil(month / 3)
 		to_branch = "freebsd/" .. year .. "Q" .. qtr
 	elseif freebsd_repo == "src" or freebsd_repo == "freebsd-src" then
-		to_branch = "freebsd/stable/14"
+		-- Use latest stable branch by default.
+		to_branch = exec_command("git for-each-ref --sort=-v:refname " ..
+			"--format='%(refname:lstrip=2)' " ..
+			"refs/remotes/freebsd/stable/* --count=1")
 		-- If pwd is a stable or release branch tree, default to it.
 		local cur_branch = exec_command("git symbolic-ref --short HEAD")
 		if string.match(cur_branch, "^stable/") then