diff --git a/errata.html b/errata.html
index c68a829..f109915 100644
--- a/errata.html
+++ b/errata.html
@@ -220,7 +220,7 @@ pre {
     <pre>{"-x * -x", eval.Env{"x": 2}, "4"}</pre>
 
     It should read:
-    <pre>{"+x * -x", Env{"x": 2}, "4"}</pre>
+    <pre>{"+x * -x", Env{"x": 2}, "-4"}</pre>
     (Thanks to Shinji Dosaka, 2016-07-15.)
   </p>