diff --git a/examples/bluetooth/bluedroid/classic_bt/hfp_ag/sdkconfig.defaults b/examples/bluetooth/bluedroid/classic_bt/hfp_ag/sdkconfig.defaults
index c7f714a012a..d79e6d40d8e 100644
--- a/examples/bluetooth/bluedroid/classic_bt/hfp_ag/sdkconfig.defaults
+++ b/examples/bluetooth/bluedroid/classic_bt/hfp_ag/sdkconfig.defaults
@@ -3,6 +3,7 @@
 CONFIG_BT_ENABLED=y
 CONFIG_BT_BLE_ENABLED=n
 CONFIG_BTDM_CTRL_MODE_BR_EDR_ONLY=y
+CONFIG_BTDM_CTRL_BR_EDR_MAX_SYNC_CONN=1
 CONFIG_BT_BLUEDROID_ENABLED=y
 CONFIG_BT_CLASSIC_ENABLED=y
 CONFIG_BT_HFP_ENABLE=y
diff --git a/examples/bluetooth/bluedroid/classic_bt/hfp_hf/sdkconfig.defaults b/examples/bluetooth/bluedroid/classic_bt/hfp_hf/sdkconfig.defaults
index e9b56e38074..4775673416a 100644
--- a/examples/bluetooth/bluedroid/classic_bt/hfp_hf/sdkconfig.defaults
+++ b/examples/bluetooth/bluedroid/classic_bt/hfp_hf/sdkconfig.defaults
@@ -3,6 +3,7 @@
 CONFIG_BT_ENABLED=y
 CONFIG_BT_BLE_ENABLED=n
 CONFIG_BTDM_CTRL_MODE_BR_EDR_ONLY=y
+CONFIG_BTDM_CTRL_BR_EDR_MAX_SYNC_CONN=1
 CONFIG_BT_BLUEDROID_ENABLED=y
 CONFIG_BT_CLASSIC_ENABLED=y
 CONFIG_BT_HFP_ENABLE=y