diff --git a/tests/bluetooth/tester/prj.conf b/tests/bluetooth/tester/prj.conf
index ae41dd8f9b2..76b2fb6cc64 100644
--- a/tests/bluetooth/tester/prj.conf
+++ b/tests/bluetooth/tester/prj.conf
@@ -12,7 +12,7 @@ CONFIG_BT_SMP_ALLOW_UNAUTH_OVERWRITE=y
 CONFIG_BT_SMP_APP_PAIRING_ACCEPT=y
 CONFIG_BT_SIGNING=y
 CONFIG_BT_BONDABLE=y
-CONFIG_BT_ATT_PREPARE_COUNT=6
+CONFIG_BT_ATT_PREPARE_COUNT=8
 CONFIG_BT_GATT_CLIENT=y
 CONFIG_BT_L2CAP_DYNAMIC_CHANNEL=y
 CONFIG_BT_DEVICE_NAME="Tester"