diff --git a/lvgl_helpers.h b/lvgl_helpers.h
index 54b4566..5ae6d75 100644
--- a/lvgl_helpers.h
+++ b/lvgl_helpers.h
@@ -25,6 +25,8 @@ extern "C" {
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ST7735S
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
+#elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_ST7796S
+#define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_HX8357
 #define DISP_BUF_SIZE  (LV_HOR_RES_MAX * 40)
 #elif defined CONFIG_LV_TFT_DISPLAY_CONTROLLER_SH1107