diff --git a/lasso/saml-2.0/login.c b/lasso/saml-2.0/login.c
index 76c31310..3484adfa 100644
--- a/lasso/saml-2.0/login.c
+++ b/lasso/saml-2.0/login.c
@@ -747,7 +747,7 @@ int
 lasso_saml20_login_build_assertion(LassoLogin *login,
 		const char *authenticationMethod,
 		const char *authenticationInstant,
-		G_GNUC_UNUSED const char *notBefore,
+		const char *notBefore,
 		const char *notOnOrAfter)
 {
 	LassoProfile *profile = &login->parent;
@@ -787,6 +787,7 @@ lasso_saml20_login_build_assertion(LassoLogin *login,
 	assertion->Issuer = LASSO_SAML2_NAME_ID(lasso_saml2_name_id_new_with_string(
 			LASSO_PROVIDER(profile->server)->ProviderID));
 	assertion->Conditions = LASSO_SAML2_CONDITIONS(lasso_saml2_conditions_new());
+	lasso_assign_string(assertion->Conditions->NotBefore, notBefore);
 	lasso_assign_string(assertion->Conditions->NotOnOrAfter, notOnOrAfter);
 
 	audience_restriction = LASSO_SAML2_AUDIENCE_RESTRICTION(