diff --git a/firmware/font.c b/firmware/font.c
index b7da31b536..c58087daa3 100644
--- a/firmware/font.c
+++ b/firmware/font.c
@@ -306,7 +306,7 @@ struct font* font_load(const char *path)
     font_reset();
 
     /* currently, font loading replaces earlier font allocation*/
-    freeptr = (unsigned char *)(((int)mbuf + 3) & ~3);
+    freeptr = (unsigned char *)(((intptr_t)mbuf + 3) & ~3);
     fileptr = freeptr;