diff --git a/lib/scheme/r5rs.sld b/lib/scheme/r5rs.sld
index c6d8e25b..cc23dad4 100644
--- a/lib/scheme/r5rs.sld
+++ b/lib/scheme/r5rs.sld
@@ -49,7 +49,6 @@
    string-ci<=? string-ci=? string-ci>? string-ci>=? string-copy
    string-fill! string-length string-ref string-set! string? string<?
    string<=? string=? string>? string>=? substring symbol->string symbol?
-   tan truncate values vector vector->list vector-fill! vector-length
-   vector-ref vector-set! vector? with-input-from-file
-   with-output-to-file write write-char zero?
-   ))
+   syntax-rules tan truncate values vector vector->list vector-fill!
+   vector-length vector-ref vector-set! vector? with-input-from-file
+   with-output-to-file write write-char zero?))