diff --git a/build/uk_master_back.xsl b/build/uk_master_back.xsl
index 295ff2b7..3baacf36 100644
--- a/build/uk_master_back.xsl
+++ b/build/uk_master_back.xsl
@@ -14,6 +14,7 @@
 
 -->
 <xsl:stylesheet version="1.0"
+	xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport"
 	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
 	xmlns:md="urn:oasis:names:tc:SAML:2.0:metadata"
 	xmlns:mdui="urn:oasis:names:tc:SAML:metadata:ui"
diff --git a/build/uk_master_export.xsl b/build/uk_master_export.xsl
index 81eab331..ec3c7f8c 100644
--- a/build/uk_master_export.xsl
+++ b/build/uk_master_export.xsl
@@ -12,6 +12,7 @@
 
 -->
 <xsl:stylesheet version="1.0"
+	xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport"
 	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
 	xmlns:elab="http://eduserv.org.uk/labels"
 	xmlns:idpdisc="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
diff --git a/build/uk_master_test.xsl b/build/uk_master_test.xsl
index 62be73ec..24f62447 100644
--- a/build/uk_master_test.xsl
+++ b/build/uk_master_test.xsl
@@ -13,6 +13,7 @@
 
 -->
 <xsl:stylesheet version="1.0"
+	xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport"
 	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
 	xmlns:elab="http://eduserv.org.uk/labels"
 	xmlns:idpdisc="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"
diff --git a/build/uk_master_unsigned.xsl b/build/uk_master_unsigned.xsl
index 547b1ca5..0b36993e 100644
--- a/build/uk_master_unsigned.xsl
+++ b/build/uk_master_unsigned.xsl
@@ -10,6 +10,7 @@
 
 -->
 <xsl:stylesheet version="1.0"
+	xmlns:alg="urn:oasis:names:tc:SAML:metadata:algsupport"
 	xmlns:ds="http://www.w3.org/2000/09/xmldsig#"
 	xmlns:elab="http://eduserv.org.uk/labels"
 	xmlns:idpdisc="urn:oasis:names:tc:SAML:profiles:SSO:idp-discovery-protocol"