diff --git a/src/include/66/service.h b/src/include/66/service.h
index 732f90431b36f8ebdce20907f0a5263fc6b680f2..fe26e010d2453214dd21e0c884501c8f8cd399e7 100644
--- a/src/include/66/service.h
+++ b/src/include/66/service.h
@@ -316,6 +316,7 @@ extern void service_resolve_write(resolve_service_t *res) ;
 extern void service_resolve_write_tmp(resolve_service_t *res, char const *dst, uint8_t force) ;
 extern int service_resolve_write_cdb(cdbmaker *c, resolve_service_t *sres) ;
 extern void service_enable_disable(graph_t *g, unsigned int idx, resolve_service_t *ares, unsigned int areslen, uint8_t action, visit_t *visit, uint8_t propagate) ;
+extern void service_switch_tree(resolve_service_t *res, char const *base, char const *totreename) ;
 /* avoid circular dependencies by prototyping the ss_state_t instead
  * of calling the state.h header file*/
 typedef struct ss_state_s ss_state_t, *ss_state_t_ref ;
diff --git a/src/lib66/service/deps-lib/deps b/src/lib66/service/deps-lib/deps
index af99bdb4e3ea311a76f60f36809883997114e78d..60b6ffb5d63fd949ea54b5c41111ceeef448f78d 100644
--- a/src/lib66/service/deps-lib/deps
+++ b/src/lib66/service/deps-lib/deps
@@ -16,6 +16,7 @@ service_resolve_write.o
 service_resolve_read_cdb.o
 service_resolve_write_cdb.o
 service_resolve_write_tmp.o
+service_switch_tree.o
 -loblibs
 -lskarnet
 
diff --git a/src/lib66/service/service_switch_tree.c b/src/lib66/service/service_switch_tree.c
new file mode 100644
index 0000000000000000000000000000000000000000..555cd84379714931e1e2683b810ca65bf67b95b9
--- /dev/null
+++ b/src/lib66/service/service_switch_tree.c
@@ -0,0 +1,40 @@
+/*
+ * service_switch_tree.c
+ *
+ * Copyright (c) 2018-2021 Eric Vidal <eric@obarun.org>
+ *
+ * All rights reserved.
+ *
+ * This file is part of Obarun. It is subject to the license terms in
+ * the LICENSE file found in the top-level directory of this
+ * distribution.
+ * This file may not be copied, modified, propagated, or distributed
+ * except according to the terms contained in the LICENSE file./
+ */
+
+#include <stdlib.h>
+
+#include <oblibs/log.h>
+
+#include <66/service.h>
+#include <66/resolve.h>
+#include <66/tree.h>
+
+void service_switch_tree(resolve_service_t *res, char const *base, char const *totreename)
+{
+    log_flow() ;
+
+    resolve_wrapper_t_ref wres = resolve_set_struct(DATA_SERVICE, res) ;
+
+    tree_service_remove(base, res->sa.s + res->treename, res->sa.s + res->name) ;
+
+    tree_service_add(base, totreename, res->sa.s + res->name) ;
+
+    if (!service_resolve_modify_field(res, E_RESOLVE_SERVICE_TREENAME, totreename))
+        log_dieu(LOG_EXIT_SYS, "modify resolve file of: ", res->sa.s + res->name) ;
+
+    if (!resolve_write_g(wres, base, res->sa.s + res->name))
+        log_dieu(LOG_EXIT_SYS, "write  resolve file of: ", res->sa.s + res->name) ;
+
+    free(wres) ;
+}
\ No newline at end of file