diff --git a/src/doveadm/doveadm-mail-mailbox.c b/src/doveadm/doveadm-mail-mailbox.c
index a86fb28810..c8b876a629 100644
--- a/src/doveadm/doveadm-mail-mailbox.c
+++ b/src/doveadm/doveadm-mail-mailbox.c
@@ -63,7 +63,7 @@ struct path_cmd_context {
 
 static const char *mailbox_list_path_type_names[] = {
 	"dir", "alt-dir", "mailbox", "alt-mailbox",
-	"control", "index", "index-private", "index-cache", "list-index",
+	"control", "index", "fts-index", "index-private", "index-cache", "list-index",
 };
 static_assert_array_size(mailbox_list_path_type_names, MAILBOX_LIST_PATH_TYPE_COUNT);
 
diff --git a/src/lib-storage/index/mbox/mbox-storage.c b/src/lib-storage/index/mbox/mbox-storage.c
index bd9ca7edd2..41216253d6 100644
--- a/src/lib-storage/index/mbox/mbox-storage.c
+++ b/src/lib-storage/index/mbox/mbox-storage.c
@@ -146,6 +146,7 @@ mbox_list_get_path(struct mailbox_list *list, const char *name,
 		*path_r = t_strconcat(t_strdup_until(path, p),
 				      "/"MBOX_INDEX_DIR_NAME"/", p+1, NULL);
 		break;
+    case MAILBOX_LIST_PATH_TYPE_FTS_INDEX:
 	case MAILBOX_LIST_PATH_TYPE_DIR:
 	case MAILBOX_LIST_PATH_TYPE_ALT_DIR:
 	case MAILBOX_LIST_PATH_TYPE_MAILBOX:
diff --git a/src/lib-storage/list/mailbox-list-fs.c b/src/lib-storage/list/mailbox-list-fs.c
index 8e4640647e..b4db77c3dc 100644
--- a/src/lib-storage/list/mailbox-list-fs.c
+++ b/src/lib-storage/list/mailbox-list-fs.c
@@ -130,6 +130,14 @@ fs_list_get_path(struct mailbox_list *_list, const char *name,
 			return 1;
 		}
 		break;
+	case MAILBOX_LIST_PATH_TYPE_FTS_INDEX:
+		if (set->fts_index_dir != NULL) {
+			if (*set->fts_index_dir == '\0')
+				return 0;
+			*path_r = fs_list_get_path_to(set, set->fts_index_dir, name);
+			return 1;
+		}
+		break;
 	case MAILBOX_LIST_PATH_TYPE_INDEX_PRIVATE:
 		if (set->index_pvt_dir == NULL)
 			return 0;
diff --git a/src/lib-storage/list/mailbox-list-maildir.c b/src/lib-storage/list/mailbox-list-maildir.c
index 7e5808e1e3..7eea592c31 100644
--- a/src/lib-storage/list/mailbox-list-maildir.c
+++ b/src/lib-storage/list/mailbox-list-maildir.c
@@ -152,6 +152,15 @@ maildir_list_get_path(struct mailbox_list *_list, const char *name,
 			return 1;
 		}
 		break;
+	case MAILBOX_LIST_PATH_TYPE_FTS_INDEX:
+		if (_list->set.fts_index_dir != NULL) {
+			if (*_list->set.fts_index_dir == '\0')
+				return 0;
+			*path_r = maildir_list_get_dirname_path(_list,
+													_list->set.fts_index_dir, name);
+			return 1;
+		}
+		break;
 	case MAILBOX_LIST_PATH_TYPE_INDEX_PRIVATE:
 		if (_list->set.index_pvt_dir == NULL)
 			return 0;
diff --git a/src/lib-storage/mail-storage-private.h b/src/lib-storage/mail-storage-private.h
index d8bc614cf6..a86adac116 100644
--- a/src/lib-storage/mail-storage-private.h
+++ b/src/lib-storage/mail-storage-private.h
@@ -856,6 +856,8 @@ int mailbox_mark_index_deleted(struct mailbox *box, bool del);
 const char *mailbox_get_path(struct mailbox *box) ATTR_PURE;
 /* Similar to mailbox_get_path() but for MAILBOX_LIST_PATH_TYPE_INDEX. */
 const char *mailbox_get_index_path(struct mailbox *box) ATTR_PURE;
+/* Check if mailbox path for type exists. */
+int mailbox_path_exists(struct mailbox *box, enum mailbox_list_path_type type);
 /* Wrapper to mailbox_list_get_path() */
 int mailbox_get_path_to(struct mailbox *box, enum mailbox_list_path_type type,
 			const char **path_r);
diff --git a/src/lib-storage/mail-storage.c b/src/lib-storage/mail-storage.c
index 05ce59d48f..93432048d9 100644
--- a/src/lib-storage/mail-storage.c
+++ b/src/lib-storage/mail-storage.c
@@ -3008,6 +3008,15 @@ const char *mailbox_get_index_path(struct mailbox *box)
 	return box->_index_path;
 }
 
+int mailbox_path_exists(struct mailbox *box, enum mailbox_list_path_type type)
+{
+    const char *path;
+    if (get_path_to(box, type, NULL, &path) < 0)
+        return 0;
+
+    return 1;
+}
+
 static void mailbox_get_permissions_if_not_set(struct mailbox *box)
 {
 	if (box->_perm.file_create_mode != 0)
diff --git a/src/lib-storage/mailbox-list.c b/src/lib-storage/mailbox-list.c
index 8a3e95eccf..ce5bc7a345 100644
--- a/src/lib-storage/mailbox-list.c
+++ b/src/lib-storage/mailbox-list.c
@@ -125,7 +125,7 @@ int mailbox_list_create(const char *driver, struct mail_namespace *ns,
 	}
 
 	if ((class->props & MAILBOX_LIST_PROP_NO_MAILDIR_NAME) != 0 &&
-	    *set->maildir_name != '\0') {
+		*set->maildir_name != '\0') {
 		*error_r = "maildir_name not supported by this driver";
 		return -1;
 	}
@@ -210,10 +210,11 @@ int mailbox_list_create(const char *driver, struct mail_namespace *ns,
 	}
 
 	e_debug(ns->user->event,
-		"%s: root=%s, index=%s, indexpvt=%s, control=%s, inbox=%s, alt=%s",
+		"%s: root=%s, index=%s, fts_index=%s, indexpvt=%s, control=%s, inbox=%s, alt=%s",
 		list->name,
 		list->set.root_dir == NULL ? "" : list->set.root_dir,
 		list->set.index_dir == NULL ? "" : list->set.index_dir,
+		list->set.fts_index_dir == NULL ? "" : list->set.fts_index_dir,
 		list->set.index_pvt_dir == NULL ? "" : list->set.index_pvt_dir,
 		list->set.control_dir == NULL ?
 		"" : list->set.control_dir,
@@ -333,6 +334,8 @@ mailbox_list_settings_parse_full(struct mail_user *user, const char *data,
 			dest = &set_r->inbox_path;
 		else if (strcmp(key, "INDEX") == 0)
 			dest = &set_r->index_dir;
+		else if (strcmp(key, "FTS_INDEX") == 0)
+			dest = &set_r->fts_index_dir;
 		else if (strcmp(key, "INDEXPVT") == 0)
 			dest = &set_r->index_pvt_dir;
 		else if (strcmp(key, "INDEXCACHE") == 0)
@@ -1485,6 +1488,22 @@ bool mailbox_list_set_get_root_path(const struct mailbox_list_settings *set,
 			path = set->root_dir;
 		}
 		break;
+	case MAILBOX_LIST_PATH_TYPE_FTS_INDEX:
+		if (set->fts_index_dir != NULL) {
+			if (set->fts_index_dir[0] == '\0') {
+				/* in-memory indexes */
+				return 0;
+			}
+			path = set->fts_index_dir;
+
+		/* Preserve the old behavior of using the index directory if
+		 * fts_index_dir is not set. */
+		} else if (set->index_dir != NULL) {
+			path = set->index_dir;
+		} else {
+			path = set->root_dir;
+		}
+		break;
 	case MAILBOX_LIST_PATH_TYPE_INDEX_PRIVATE:
 		path = set->index_pvt_dir;
 		break;
diff --git a/src/lib-storage/mailbox-list.h b/src/lib-storage/mailbox-list.h
index 27e8f4655b..8d027bd040 100644
--- a/src/lib-storage/mailbox-list.h
+++ b/src/lib-storage/mailbox-list.h
@@ -95,6 +95,8 @@ enum mailbox_list_path_type {
 	/* Return mailbox list index directory (usually same as
 	   MAILBOX_LIST_PATH_TYPE_INDEX) */
 	MAILBOX_LIST_PATH_TYPE_LIST_INDEX,
+	/* Return mailbox fts index directory path */
+	MAILBOX_LIST_PATH_TYPE_FTS_INDEX,
 
 	MAILBOX_LIST_PATH_TYPE_COUNT
 };
@@ -115,6 +117,7 @@ struct mailbox_list_settings {
 	const char *layout; /* FIXME: shouldn't be here */
 	const char *root_dir;
 	const char *index_dir;
+	const char *fts_index_dir;
 	const char *index_pvt_dir;
 	const char *index_cache_dir;
 	const char *control_dir;
diff --git a/src/plugins/fts-flatcurve/fts-backend-flatcurve.c b/src/plugins/fts-flatcurve/fts-backend-flatcurve.c
index 76d2871a5b..fbbfd572e7 100644
--- a/src/plugins/fts-flatcurve/fts-backend-flatcurve.c
+++ b/src/plugins/fts-flatcurve/fts-backend-flatcurve.c
@@ -125,14 +125,22 @@ fts_backend_flatcurve_set_mailbox(struct flatcurve_fts_backend *backend,
 		return -1;
 	}
 
-	if (mailbox_open(box) < 0 ||
-	    mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_INDEX, &path) <= 0) {
+	if (mailbox_open(box) < 0
+		|| (mailbox_path_exists(box, MAILBOX_LIST_PATH_TYPE_INDEX) == 0 &&
+			mailbox_path_exists(box, MAILBOX_LIST_PATH_TYPE_FTS_INDEX) == 0)
+		) {
 		*error_r = t_strdup_printf("Could not open mailbox: %s: %s",
-					   box->vname,
-					   mailbox_get_last_internal_error(box, NULL));
+						box->vname,
+						mailbox_get_last_internal_error(box, NULL));
 		return -1;
 	}
 
+	if (mailbox_path_exists(box, MAILBOX_LIST_PATH_TYPE_FTS_INDEX)) {
+		mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_FTS_INDEX, &path);
+	} else {
+		mailbox_get_path_to(box, MAILBOX_LIST_PATH_TYPE_INDEX, &path);
+	}
+
 	str_append(backend->boxname, box->vname);
 	str_printfa(backend->db_path, "%s/%s/", path, FTS_FLATCURVE_LABEL);
 
diff --git a/src/plugins/fts/fts-storage.c b/src/plugins/fts/fts-storage.c
index cf84b9042b..5095123000 100644
--- a/src/plugins/fts/fts-storage.c
+++ b/src/plugins/fts/fts-storage.c
@@ -959,7 +959,9 @@ fts_mailbox_list_created(struct mailbox_list *list)
 		return;
 	}
 
-	if (!mailbox_list_get_root_path(list, MAILBOX_LIST_PATH_TYPE_INDEX, &path)) {
+	/* TODO: Create config item for MAILBOX_LIST_PATH_TYPE... FTS_INDEX||=INDEX */
+	bool has_fts_index_path = mailbox_list_get_root_path(list, MAILBOX_LIST_PATH_TYPE_FTS_INDEX, &path);
+	if (!mailbox_list_get_root_path(list, MAILBOX_LIST_PATH_TYPE_INDEX, &path) && !has_fts_index_path) {
 		e_debug(list->ns->user->event,
 			"fts: Indexes disabled for namespace '%s'",
 			list->ns->prefix);