diff --git a/CHANGELOG b/CHANGELOG
index 788e4ba03..602d55305 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -8,6 +8,7 @@ CHANGELOG Roundcube Webmail
 - Fix bug where Enter key didn't work on messages list in "List" layout (#7052)
 - Fix bug where deleting a saved search in addressbook caused display issue on sources/groups list (#7061)
 - Fix bug where a new contact group added after removing all groups from addressbook wasn't added to the list
+- Fix bug where Ctype extension wasn't required in Installer and INSTALL file (#7049)
 
 RELEASE 1.4.1
 -------------
diff --git a/INSTALL b/INSTALL
index ee8fccee3..4c7c9b15a 100644
--- a/INSTALL
+++ b/INSTALL
@@ -12,7 +12,7 @@ REQUIREMENTS
 * An IMAP, HTTP and SMTP server
 * .htaccess support allowing overrides for DirectoryIndex
 * PHP Version 5.4 or greater including:
-   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring (required)
+   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Ctype (required)
    - PHP PDO with driver for either MySQL, PostgreSQL, SQL Server, Oracle or SQLite (required)
    - Iconv, Zip, Fileinfo, Intl, Exif (recommended)
    - LDAP for LDAP addressbook support (optional)
diff --git a/installer/check.php b/installer/check.php
index 0c5175cbb..2500e8cba 100644
--- a/installer/check.php
+++ b/installer/check.php
@@ -31,6 +31,7 @@ $required_php_exts = array(
     'PDO'       => 'PDO',
     'Multibyte' => 'mbstring',
     'OpenSSL'   => 'openssl',
+    'Ctype'     => 'ctype',
 );
 
 $optional_php_exts = array(
@@ -87,6 +88,7 @@ $source_urls = array(
     'GD'        => 'http://www.php.net/manual/en/book.image.php',
     'Imagick'   => 'http://www.php.net/manual/en/book.imagick.php',
     'Zip'       => 'http://www.php.net/manual/en/book.zip.php',
+    'Ctype'     => 'http://www.php.net/manual/en/book.ctype.php',
     'pdo_mysql'   => 'http://www.php.net/manual/en/ref.pdo-mysql.php',
     'pdo_pgsql'   => 'http://www.php.net/manual/en/ref.pdo-pgsql.php',
     'pdo_sqlite'  => 'http://www.php.net/manual/en/ref.pdo-sqlite.php',
diff --git a/program/lib/Roundcube/README.md b/program/lib/Roundcube/README.md
index fd8b4dd6e..2c242b025 100644
--- a/program/lib/Roundcube/README.md
+++ b/program/lib/Roundcube/README.md
@@ -19,7 +19,7 @@ tasks:
 REQUIREMENTS
 ------------
 PHP Version 5.4 or greater including:
-   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring (required)
+   - PCRE, DOM, JSON, Session, Sockets, OpenSSL, Mbstring, Ctype (required)
    - PHP PDO with driver for either MySQL, PostgreSQL, SQL Server, Oracle or SQLite (required)
    - Libiconv, Zip, Fileinfo, Intl, Exif (recommended)
    - LDAP for LDAP addressbook support (optional)