diff --git a/lib/srfi/159/color.sld b/lib/srfi/159/color.sld
index 2c77fb8e..06babc1b 100644
--- a/lib/srfi/159/color.sld
+++ b/lib/srfi/159/color.sld
@@ -4,4 +4,5 @@
   (export as-red as-blue as-green as-cyan as-yellow
           as-magenta as-white as-black
           as-bold as-underline)
+  (begin (define (make-state-variable . o) #f))
   (include "../166/color.scm"))