diff --git a/builtin/add.c b/builtin/add.c
index 3cc341d961..27cd8d0881 100644
--- a/builtin/add.c
+++ b/builtin/add.c
@@ -31,6 +31,7 @@ static int take_worktree_changes;
 static int add_renormalize;
 static int pathspec_file_nul;
 static const char *pathspec_from_file;
+static int legacy_stash_p; /* support for the scripted `git stash` */
 
 struct update_callback_data {
 	int flags;
@@ -339,6 +340,8 @@ static struct option builtin_add_options[] = {
 			N_("warn when adding an embedded repository")),
 	OPT_PATHSPEC_FROM_FILE(&pathspec_from_file),
 	OPT_PATHSPEC_FILE_NUL(&pathspec_file_nul),
+	OPT_HIDDEN_BOOL(0, "legacy-stash-p", &legacy_stash_p,
+			N_("backend for `git stash -p`")),
 	OPT_END(),
 };
 
@@ -439,6 +442,18 @@ int cmd_add(int argc, const char **argv, const char *prefix)
 		exit(interactive_add(argc - 1, argv + 1, prefix, patch_interactive));
 	}
 
+	if (legacy_stash_p) {
+		struct pathspec pathspec;
+
+		parse_pathspec(&pathspec, 0,
+			PATHSPEC_PREFER_FULL |
+			PATHSPEC_SYMLINK_LEADING_PATH |
+			PATHSPEC_PREFIX_ORIGIN,
+			prefix, argv);
+
+		return run_add_interactive(NULL, "--patch=stash", &pathspec);
+	}
+
 	if (edit_interactive) {
 		if (pathspec_from_file)
 			die(_("--pathspec-from-file is incompatible with --edit"));
diff --git a/git-legacy-stash.sh b/git-legacy-stash.sh
index 53fa574301..4d4ebb4f2b 100755
--- a/git-legacy-stash.sh
+++ b/git-legacy-stash.sh
@@ -207,7 +207,7 @@ create_stash () {
 
 		# find out what the user wants
 		GIT_INDEX_FILE="$TMP-index" \
-			git add--interactive --patch=stash -- "$@" &&
+			git add --legacy-stash-p -- "$@" &&
 
 		# state of the working tree
 		w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||