diff --git a/xml/chapter3/section5/subsection1.xml b/xml/chapter3/section5/subsection1.xml
index 228d0c155..e378de4b8 100644
--- a/xml/chapter3/section5/subsection1.xml
+++ b/xml/chapter3/section5/subsection1.xml
@@ -1412,7 +1412,7 @@ function stream_map_2_optimized(f, s1, s2) {
     return is_null(s1) || is_null(s2)
         ? null
         : pair(f(head(s1), head(s2)),
-                memo(() => stream_map_2(f, stream_tail(s1), stream_tail(s2))));
+                memo(() => stream_map_2_optimized(f, stream_tail(s1), stream_tail(s2))));
 }
 	    </JAVASCRIPT>
 	  </SNIPPET>