diff --git a/PostgreSQL/OMOP CDM postgresql constraints.txt b/PostgreSQL/OMOP CDM postgresql constraints.txt
index 2fed63c..d313dae 100644
--- a/PostgreSQL/OMOP CDM postgresql constraints.txt	
+++ b/PostgreSQL/OMOP CDM postgresql constraints.txt	
@@ -181,7 +181,7 @@ ALTER TABLE visit_occurrence ADD CONSTRAINT fpk_visit_provider FOREIGN KEY (prov
 
 ALTER TABLE visit_occurrence ADD CONSTRAINT fpk_visit_care_site FOREIGN KEY (care_site_id)  REFERENCES care_site (care_site_id);
 
-ALTER TABLE visit_occurrence ADD CONSTRAINT fpk_ visit_concept_s FOREIGN KEY (visit_source_concept_id)  REFERENCES concept (concept_id);
+ALTER TABLE visit_occurrence ADD CONSTRAINT fpk_visit_concept_s FOREIGN KEY (visit_source_concept_id)  REFERENCES concept (concept_id);
 
 ALTER TABLE visit_occurrence ADD CONSTRAINT fpk_visit_admitting_s FOREIGN KEY (admitting_source_concept_id) REFERENCES concept (concept_id);