diff --git a/tests/bluetooth/mesh_shell/prj.conf b/tests/bluetooth/mesh_shell/prj.conf
index 039e5a9a69d..e34446873a6 100644
--- a/tests/bluetooth/mesh_shell/prj.conf
+++ b/tests/bluetooth/mesh_shell/prj.conf
@@ -27,6 +27,7 @@ CONFIG_BT_CTLR_PRIVACY=n
 CONFIG_BT_RX_BUF_COUNT=30
 CONFIG_BT_L2CAP_RX_MTU=69
 CONFIG_BT_L2CAP_TX_MTU=69
+CONFIG_BT_L2CAP_TX_BUF_COUNT=4
 
 CONFIG_BT_MESH=y
 CONFIG_BT_MESH_SHELL=y