diff --git a/docs/simplesamlphp-changelog.md b/docs/simplesamlphp-changelog.md
index a2cc24cf11ce7035034e0c4779f7911db724d7c9..7054da7aee29b60ad591e939338da819dfe69efe 100644
--- a/docs/simplesamlphp-changelog.md
+++ b/docs/simplesamlphp-changelog.md
@@ -16,6 +16,7 @@ Released TBD
   * Fixed compatibility with Composer pre 1.8.5 (Debian 10) (#1427)
   * Updated npm dependencies up to February 1, 2021
   * Fixed a bug where it was impossible to set WantAssertionsSigned=true on SP-metadata (#1433)
+  * Make inResponseTo available in state array (#1447)
 
 ### authorize
   * Fix a bug in the Twig-template that causes an exception in Twig strict vars mode
diff --git a/modules/saml/www/sp/saml2-acs.php b/modules/saml/www/sp/saml2-acs.php
index 7d5c39a792dc6a2d32e1afd4b1f30a22b54272c9..a1b603d8ce127b4c56b766156ab80bbcad63a604 100644
--- a/modules/saml/www/sp/saml2-acs.php
+++ b/modules/saml/www/sp/saml2-acs.php
@@ -261,6 +261,7 @@ if ($expire !== null) {
 $state['saml:sp:prevAuth'] = [
     'id'     => $response->getId(),
     'issuer' => $issuer,
+    'inResponseTo' => $response->getInResponseTo(),
 ];
 if (isset($state['\SimpleSAML\Auth\Source.ReturnURL'])) {
     $state['saml:sp:prevAuth']['redirect'] = $state['\SimpleSAML\Auth\Source.ReturnURL'];