diff --git a/app/boards/nrf5340dk_nrf5340_cpuapp.overlay b/app/boards/nrf5340dk_nrf5340_cpuapp.overlay
index 66d2332f1a2..9427d9ca150 100644
--- a/app/boards/nrf5340dk_nrf5340_cpuapp.overlay
+++ b/app/boards/nrf5340dk_nrf5340_cpuapp.overlay
@@ -6,5 +6,5 @@
 
 &arduino_i2c {
     // Default buffer size is too small for use with displays.
-    zephyr,concat-buf-size = <512>;
+    zephyr,concat-buf-size = <1024>;
 };