diff --git a/bsp/stm32/stm32f429-fire-challenger/board/ports/lcd_port.h b/bsp/stm32/stm32f429-fire-challenger/board/ports/lcd_port.h
index fc01e6f4ae54c0732cd20a43de6cabd96b2df214..2660f3931b3b5be32252d3761037c451890216cb 100644
--- a/bsp/stm32/stm32f429-fire-challenger/board/ports/lcd_port.h
+++ b/bsp/stm32/stm32f429-fire-challenger/board/ports/lcd_port.h
@@ -15,7 +15,7 @@
 #define LCD_WIDTH           800
 #define LCD_HEIGHT          480
 #define LCD_BITS_PER_PIXEL  16
-#define LCD_BUF_SIZE        (LCD_WIDTH * LCD_HEIGHT * BITS_PER_PIXEL / 8)
+#define LCD_BUF_SIZE        (LCD_WIDTH * LCD_HEIGHT * LCD_BITS_PER_PIXEL / 8)
 #define LCD_PIXEL_FORMAT    RTGRAPHIC_PIXEL_FORMAT_RGB565
 
 #define LCD_HSYNC_WIDTH     2