diff --git a/BigQuery/OMOP CDM bigquery ddl.txt b/BigQuery/OMOP CDM bigquery ddl.txt
index 4d7c58a..8479a73 100644
--- a/BigQuery/OMOP CDM bigquery ddl.txt	
+++ b/BigQuery/OMOP CDM bigquery ddl.txt	
@@ -548,7 +548,7 @@ create table care_site
 (
   care_site_id					INT64	not null ,
   care_site_name				STRING  null ,
-  place_of_service_concept_id	INT64	null ,
+  place_of_service_concept_id	INT64	not null ,
   location_id					INT64	null ,
   care_site_source_value		STRING	null ,
   place_of_service_source_value STRING	null