diff --git a/reference/mbstring/functions/mb-substitute-character.xml b/reference/mbstring/functions/mb-substitute-character.xml
index aa698a1238..be1686b646 100644
--- a/reference/mbstring/functions/mb-substitute-character.xml
+++ b/reference/mbstring/functions/mb-substitute-character.xml
@@ -10,7 +10,7 @@
   &reftitle.description;
   <methodsynopsis>
    <type>mixed</type><methodname>mb_substitute_character</methodname>
-   <methodparam choice="opt"><type>mixed</type><parameter>substrchar</parameter><initializer>mb_substitute_character()</initializer></methodparam>
+   <methodparam choice="opt"><type>mixed</type><parameter>substchar</parameter><initializer>mb_substitute_character()</initializer></methodparam>
   </methodsynopsis>
   <para>
    Specifies a substitution character when input character encoding is invalid
@@ -31,7 +31,7 @@
   <para>
    <variablelist>
     <varlistentry>
-     <term><parameter>substrchar</parameter></term>
+     <term><parameter>substchar</parameter></term>
      <listitem>
       <para>
        Specify the Unicode value as an <type>integer</type>,