diff --git a/boards/nxp/frdm_mcxc242/Kconfig.defconfig b/boards/nxp/frdm_mcxc242/Kconfig.defconfig
new file mode 100644
index 00000000000..6028882b542
--- /dev/null
+++ b/boards/nxp/frdm_mcxc242/Kconfig.defconfig
@@ -0,0 +1,16 @@
+#
+# Copyright 2025 NXP
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+if BOARD_FRDM_MCXC242
+
+if USB_CDC_ACM
+
+config USB_CDC_ACM_RINGBUF_SIZE
+	default 256
+
+endif #USB_CDC_ACM
+
+endif #BOARD_FRDM_MCXC242