diff -pur libid3tag-0.15.1b-orig/compat.h libid3tag-0.15.1b/compat.h
--- libid3tag-0.15.1b-orig/compat.h	2004-01-23 10:41:32.000000000 +0100
+++ libid3tag-0.15.1b/compat.h	2017-03-15 01:49:23.808834401 +0100
@@ -34,7 +34,7 @@ struct id3_compat {
 };
 
 struct id3_compat const *id3_compat_lookup(register char const *,
-					   register unsigned int);
+					   register size_t);
 
 int id3_compat_fixup(struct id3_tag *);