diff --git a/source/structure/r4.sindri.json b/source/structure/r4.sindri.json
index 77cf361..fe21b7d 100644
--- a/source/structure/r4.sindri.json
+++ b/source/structure/r4.sindri.json
@@ -65,7 +65,7 @@
 				{
 					"name": "name_real_index",
 					"type": "integer",
-					"nullable": true
+					"nullable": false
 				},
 				{
 					"name": "email_address_private",