diff --git a/micropython/extmod/modtrezorui/font_bitmap.c b/micropython/extmod/modtrezorui/font_bitmap.c
index b7e7a1eb..6534f2b8 100644
--- a/micropython/extmod/modtrezorui/font_bitmap.c
+++ b/micropython/extmod/modtrezorui/font_bitmap.c
@@ -1,6 +1,6 @@
 #include "font_bitmap.h"
 
-const uint8_t *Font_Bitmap = (const uint8_t *)
+const uint8_t * const Font_Bitmap = (const uint8_t * const)
     "\x00\x00\x00\x00\x00"
     "\x00\x00\x5f\x00\x00"
     "\x00\x07\x00\x07\x00"
diff --git a/micropython/extmod/modtrezorui/font_bitmap.h b/micropython/extmod/modtrezorui/font_bitmap.h
index 71de4c11..804bc55e 100644
--- a/micropython/extmod/modtrezorui/font_bitmap.h
+++ b/micropython/extmod/modtrezorui/font_bitmap.h
@@ -1,3 +1,3 @@
 #include <stdint.h>
 
-extern const uint8_t *Font_Bitmap;
+extern const uint8_t * const Font_Bitmap;