diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5684dc80..c6051785 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 Features
 
 - Enhanced the reader to parse rationals and store them as inexact numbers.
+- Add a stub for `(rationalize x y)` to `(scheme base)`.
 
 Bug Fixes
 
diff --git a/scheme/base.sld b/scheme/base.sld
index bb35f6aa..669b8cde 100644
--- a/scheme/base.sld
+++ b/scheme/base.sld
@@ -205,15 +205,10 @@
     write-u8
     binary-port?
     textual-port?
-
+    rationalize
 ;;;;
 ; Possibly missing functions:
-;
 ;    u8-ready?
-;
-;    ; No complex or rational numbers at this time
-;    rationalize
-;
 ;    ;; syntax-rules
 ;;;;
   )
@@ -1483,6 +1478,9 @@
     "(void *data, object ptr, object z)"
     " return Cyc_is_complex(z); ")
   (define rational? number?)
+  ;; Stub, doesn't do much now because rationals are not supported
+  (define (rationalize x y)
+    (/ x y))
   (define (max first . rest) (foldl (lambda (old new) (if (> old new) old new)) first rest))
   (define (min first . rest) (foldl (lambda (old new) (if (< old new) old new)) first rest))
   ; Implementations of gcd and lcm using Euclid's algorithm