diff --git a/lib/srfi/159.sld b/lib/srfi/159.sld
index 84a5b7d7..44a763d9 100644
--- a/lib/srfi/159.sld
+++ b/lib/srfi/159.sld
@@ -5,7 +5,7 @@
   (export
    ;; base
    show fn forked with with! each each-in-list call-with-output
-   displayed written written-shared written-simply
+   displayed written written-simply pretty pretty-simply
    numeric numeric/comma numeric/si numeric/fitted
    nothing nl fl space-to tab-to escaped maybe-escaped
    padded padded/right padded/both
diff --git a/lib/srfi/159/base.sld b/lib/srfi/159/base.sld
index 4aff5ed6..8926d53b 100644
--- a/lib/srfi/159/base.sld
+++ b/lib/srfi/159/base.sld
@@ -1,9 +1,9 @@
 
 (define-library (srfi 159 base)
-  (import (chibi show))
+  (import (chibi show) (chibi show pretty))
   (export
    show fn forked with with! each each-in-list call-with-output
-   displayed written written-shared written-simply
+   displayed written written-simply pretty pretty-simply
    numeric numeric/comma numeric/si numeric/fitted
    nothing nl fl space-to tab-to escaped maybe-escaped
    padded padded/right padded/both