diff --git a/tests/scripts/expect/_common.exp b/tests/scripts/expect/_common.exp
index 799088043..8c46dc931 100644
--- a/tests/scripts/expect/_common.exp
+++ b/tests/scripts/expect/_common.exp
@@ -118,6 +118,7 @@ proc spawn_node {id {type ""} {args ""}} {
             # avoid the error: "bind(sTxFd): Address already in use"
             sleep 0.2
             spawn /usr/bin/env GCOV_PREFIX=$gcov_prefix $ot_posix_apps/ot-cli $radio_url
+            sleep 0.1
             send "factoryreset\n"
             wait_for "state" "disabled"
             expect_line "Done"
@@ -127,6 +128,7 @@ proc spawn_node {id {type ""} {args ""}} {
         cli {
             spawn /usr/bin/env GCOV_PREFIX=$gcov_prefix $ot_simulation_apps/cli/ot-cli-ftd \
                 -L$ot_simulation_local_host $id
+            sleep 0.1
             send "factoryreset\n"
             wait_for "state" "disabled"
             expect_line "Done"
@@ -136,6 +138,7 @@ proc spawn_node {id {type ""} {args ""}} {
         mtd {
             spawn /usr/bin/env GCOV_PREFIX=$gcov_prefix $ot_simulation_apps/cli/ot-cli-mtd \
                 -L$ot_simulation_local_host $id
+            sleep 0.1
             send "factoryreset\n"
             wait_for "state" "disabled"
             expect_line "Done"