diff --git a/lvgl_helpers.h b/lvgl_helpers.h
index 15eb645..6e7cf23 100644
--- a/lvgl_helpers.h
+++ b/lvgl_helpers.h
@@ -51,7 +51,7 @@ extern "C" {
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ILI9488
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ILI9341
-#define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 64)
+#define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SSD1306
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * (LV_VER_RES_MAX / 8))
 #elif defined (CONFIG_LV_TFT_DISPLAY_CONTROLLER_FT81X)