diff --git a/src/boards/include/boards/pimoroni_plasma2350.h b/src/boards/include/boards/pimoroni_plasma2350.h
index fa79e15d..8604f023 100644
--- a/src/boards/include/boards/pimoroni_plasma2350.h
+++ b/src/boards/include/boards/pimoroni_plasma2350.h
@@ -104,9 +104,9 @@
 #define PICO_FLASH_SPI_CLKDIV 2
 #endif
 
-// pico_cmake_set_default PICO_FLASH_SIZE_BYTES = (8 * 1024 * 1024)
+// pico_cmake_set_default PICO_FLASH_SIZE_BYTES = (4 * 1024 * 1024)
 #ifndef PICO_FLASH_SIZE_BYTES
-#define PICO_FLASH_SIZE_BYTES (8 * 1024 * 1024)
+#define PICO_FLASH_SIZE_BYTES (4 * 1024 * 1024)
 #endif
 
 #ifndef PICO_RP2350_A2_SUPPORTED