diff --git a/tests/bluetooth/tester/src/audio/btp_bap_audio_stream.c b/tests/bluetooth/tester/src/audio/btp_bap_audio_stream.c
index 4cbc0883f9e..e294cacbaea 100644
--- a/tests/bluetooth/tester/src/audio/btp_bap_audio_stream.c
+++ b/tests/bluetooth/tester/src/audio/btp_bap_audio_stream.c
@@ -23,7 +23,8 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME, CONFIG_BTTESTER_LOG_LEVEL);
 
 NET_BUF_POOL_FIXED_DEFINE(tx_pool, MAX(CONFIG_BT_ASCS_ASE_SRC_COUNT,
 			  CONFIG_BT_BAP_UNICAST_CLIENT_ASE_SRC_COUNT),
-			  BT_ISO_SDU_BUF_SIZE(CONFIG_BT_ISO_TX_MTU), 8, NULL);
+			  BT_ISO_SDU_BUF_SIZE(CONFIG_BT_ISO_TX_MTU),
+			  CONFIG_BT_CONN_TX_USER_DATA_SIZE, NULL);
 
 RING_BUF_DECLARE(audio_ring_buf, CONFIG_BT_ISO_TX_MTU);
 
diff --git a/tests/bluetooth/tester/src/btp_l2cap.c b/tests/bluetooth/tester/src/btp_l2cap.c
index ff78fa9ad55..69c438f7f6f 100644
--- a/tests/bluetooth/tester/src/btp_l2cap.c
+++ b/tests/bluetooth/tester/src/btp_l2cap.c
@@ -25,7 +25,8 @@ LOG_MODULE_REGISTER(LOG_MODULE_NAME, CONFIG_BTTESTER_LOG_LEVEL);
 #define CHANNELS 2
 #define SERVERS 1
 
-NET_BUF_POOL_FIXED_DEFINE(data_pool, CHANNELS, DATA_BUF_SIZE, 8, NULL);
+NET_BUF_POOL_FIXED_DEFINE(data_pool, CHANNELS, DATA_BUF_SIZE, CONFIG_BT_CONN_TX_USER_DATA_SIZE,
+			  NULL);
 
 static bool authorize_flag;
 static uint8_t req_keysize;