diff --git a/reference/pcre/pattern.syntax.xml b/reference/pcre/pattern.syntax.xml
index 48f3b1d8c8..02f837ef6a 100644
--- a/reference/pcre/pattern.syntax.xml
+++ b/reference/pcre/pattern.syntax.xml
@@ -600,7 +600,7 @@
    regexp metacharacters in the pattern. For example:
    <literal>\w+\Q.$.\E$</literal> will match one or more word characters,
    followed by literals <literal>.$.</literal> and anchored at the end of
-   the string. Note that this does not change the behaviour of 
+   the string. Note that this does not change the behavior of 
    delimiters; for instance the pattern <literal>#\Q#\E#$</literal>
    is not valid, because the second <literal>#</literal> marks the end
    of the pattern, and the <literal>\E#</literal> is interpreted as invalid