diff --git a/lcd/fonts.h b/lcd/fonts.h
index 6d281d9..4372931 100644
--- a/lcd/fonts.h
+++ b/lcd/fonts.h
@@ -22,6 +22,6 @@ struct FONT_DEF {
     const FONT_CHAR_INFO *charInfo; /* Pointer to array of char information */
 };
 
-typedef struct FONT_DEF * FONT;
+typedef const struct FONT_DEF * FONT;
 
 #endif