--- libappstream-glib/as-tag.c.ORIG	2016-12-21 17:01:41.000000000 +0100
+++ libappstream-glib/as-tag.c.ORIG	2017-01-23 10:54:47.997035434 +0100
@@ -37,7 +37,7 @@ 
 
 #ifdef HAVE_GPERF
   /* we need to define this now as gperf just writes a big header file */
-  const struct tag_data *_as_tag_from_gperf (const char *tag, guint etag);
+  const struct tag_data *_as_tag_from_gperf (register const char *tag, register size_t len);
   #include "as-tag-private.h"
 #endif