diff --git a/tests/bsim/bluetooth/audio/prj.conf b/tests/bsim/bluetooth/audio/prj.conf
index 87e99c270a9..9ca0a167b61 100644
--- a/tests/bsim/bluetooth/audio/prj.conf
+++ b/tests/bsim/bluetooth/audio/prj.conf
@@ -42,10 +42,11 @@ CONFIG_BT_BAP_BROADCAST_SRC_SUBGROUP_COUNT=1
 CONFIG_BT_BAP_BROADCAST_SNK_SUBGROUP_COUNT=1
 CONFIG_BT_BAP_BROADCAST_SNK_STREAM_COUNT=2
 CONFIG_BT_ISO_PERIPHERAL=y
-CONFIG_BT_ISO_TX_BUF_COUNT=4
 CONFIG_BT_ISO_MAX_CHAN=4
 CONFIG_BT_ISO_TX_MTU=310
+CONFIG_BT_ISO_TX_BUF_COUNT=4
 CONFIG_BT_ISO_RX_MTU=310
+CONFIG_BT_ISO_RX_BUF_COUNT=4
 
 CONFIG_BT_GAP_AUTO_UPDATE_CONN_PARAMS=n