diff --git a/src/base/system_info.h b/src/base/system_info.h
index 39d1c2ee1..c4eff7f49 100644
--- a/src/base/system_info.h
+++ b/src/base/system_info.h
@@ -1,4 +1,4 @@
-/**
+/**
  * File:   system_info.h
  * Author: Li XianJing <xianjimli@hotmail.com>
  * Brief:  system info
@@ -33,7 +33,7 @@ typedef struct _system_info_t {
   float_t device_pixel_ratio;
 } system_info_t;
 
-system_info_t* system_info();
+system_info_t* system_info(void);
 
 END_C_DECLS
 
diff --git a/src/lcd/rgb565.h b/src/lcd/rgb565.h
index 958f1c0a5..9f15adf19 100644
--- a/src/lcd/rgb565.h
+++ b/src/lcd/rgb565.h
@@ -43,7 +43,7 @@ static inline color_t to_color(pixel_t pixel) {
   uint16_t g = (0xff & ((pixel >> 5) << 2));
   uint16_t b = (0xff & (pixel << 3));
 
-  return color_init(r, g, b, a);
+  return color_init(r, g, b, 0xff);
 }
 
 static inline pixel_t blend_pixel(pixel_t pixel, color_t c) {