1 files changed, 1 insertions, 1 deletions
diff --git a/lib/util/xfile.h b/lib/util/xfile.h
index 2cc369d8d8..aa14b7c30a 100644
--- a/lib/util/xfile.h
+++ b/lib/util/xfile.h
@@ -62,7 +62,7 @@ int x_fclose(XFILE *f);
 size_t x_fwrite(const void *p, size_t size, size_t nmemb, XFILE *f);
 
 /** thank goodness for asprintf() */
-int x_fileno(XFILE *f);
+int x_fileno(const XFILE *f);
 
 /** simulate fflush() */
 int x_fflush(XFILE *f);