diff --git a/spec.html b/spec.html
index 72c4edcbabd..27e69e5968d 100644
--- a/spec.html
+++ b/spec.html
@@ -34002,7 +34002,8 @@ <h1>
                 1. Let _digits_ be the substring of _templateRemainder_ from 1 to 1 + _digitCount_.
                 1. Let _index_ be ℝ(StringToNumber(_digits_)).
                 1. Assert: 0 &le; _index_ &le; 99.
-                1. If 0 &lt; _index_ &le; the number of elements in _captures_, then
+                1. Let _captureLen_ be the number of elements in _captures_.
+                1. If 0 &lt; _index_ &le; _captureLen_, then
                   1. Let _capture_ be _captures_[_index_ - 1].
                   1. If _capture_ is *undefined*, then
                     1. Let _refReplacement_ be the empty String.