1 files changed, 1 insertions, 1 deletions
diff --git a/util.h b/util.h
index 9d38ede..1547707 100644
--- a/util.h
+++ b/util.h
@@ -65,7 +65,7 @@ extern char *xstrndup(const char *s, size_t len);
 
 extern int PRINTF(2, 3) xasprintf(char **strp, const char *fmt, ...);
 extern int PRINTF(2, 3) xasprintf_append(char **strp, const char *fmt, ...);
-extern int xavsprintf_append(char **strp, const char *fmt, va_list ap);
+extern int PRINTF(2, 0) xavsprintf_append(char **strp, const char *fmt, va_list ap);
 extern char *join_path(const char *path, const char *name);
 
 /**