diff --git a/zephcore/boards/nrf52840/lilygo_timpulse_plus/lilygo_timpulse_plus.dts b/zephcore/boards/nrf52840/lilygo_timpulse_plus/lilygo_timpulse_plus.dts
index 8ede63f..50f40a9 100644
--- a/zephcore/boards/nrf52840/lilygo_timpulse_plus/lilygo_timpulse_plus.dts
+++ b/zephcore/boards/nrf52840/lilygo_timpulse_plus/lilygo_timpulse_plus.dts
@@ -259,9 +259,9 @@
 	status = "okay";
 	clock-frequency = <I2C_BITRATE_FAST>;
 	/* TWIM DMA needs one contiguous buffer; SSD1306 driver sends
-	 * control byte + up to 256B framebuffer chunks. Default 16B
-	 * concat buffer drops every display flush. */
-	zephyr,concat-buf-size = <256>;
+	 * 1 control byte + 256B framebuffer chunks in one message. Default
+	 * 16B concat buffer drops every display flush. */
+	zephyr,concat-buf-size = <257>;
 	pinctrl-0 = <&i2c0_default>;
 	pinctrl-1 = <&i2c0_sleep>;
 	pinctrl-names = "default", "sleep";