diff --git a/DC-SLES-SAP-sol-automation b/DC-SLES-SAP-sol-automation
index 696fecf..2c0de00 100644
--- a/DC-SLES-SAP-sol-automation
+++ b/DC-SLES-SAP-sol-automation
@@ -5,3 +5,4 @@ PROFOS="sles"
 PROFCONDITION="noquick;suse-product"
 
 STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2022-ns"
+DOCBOOK5_RNG_URI="http://docbook.org/xml/5.2/rng/docbookxi.rng"
diff --git a/DC-SLES-SAP-sol-monitoring b/DC-SLES-SAP-sol-monitoring
index 40d46c7..76a6e1b 100644
--- a/DC-SLES-SAP-sol-monitoring
+++ b/DC-SLES-SAP-sol-monitoring
@@ -5,3 +5,4 @@ PROFOS="sles"
 PROFCONDITION="noquick;suse-product"
 
 STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2022-ns"
+DOCBOOK5_RNG_URI="http://docbook.org/xml/5.2/rng/docbookxi.rng"
diff --git a/DC-SLES4SAP-guide b/DC-SLES4SAP-guide
index 6d0db86..c5b6e5c 100644
--- a/DC-SLES4SAP-guide
+++ b/DC-SLES4SAP-guide
@@ -6,3 +6,4 @@ PROFCONDITION="noquick;suse-product"
 
 STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2022-ns"
 FALLBACK_STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2021-ns"
+DOCBOOK5_RNG_URI="http://docbook.org/xml/5.2/rng/docbookxi.rng"
diff --git a/DC-SLES4SAP-quick b/DC-SLES4SAP-quick
index 7ba5fb3..0cc0829 100644
--- a/DC-SLES4SAP-quick
+++ b/DC-SLES4SAP-quick
@@ -6,3 +6,4 @@ PROFCONDITION="quick;suse-product"
 
 STYLEROOT="/usr/share/xml/docbook/stylesheet/suse2022-ns"
 
+DOCBOOK5_RNG_URI="http://docbook.org/xml/5.2/rng/docbookxi.rng"