diff --git a/src/main/resources/update/1_5.sql b/src/main/resources/update/1_5.sql
index 7fb0aaa..03fc1bf 100644
--- a/src/main/resources/update/1_5.sql
+++ b/src/main/resources/update/1_5.sql
@@ -17,6 +17,5 @@
 
 ALTER TABLE PULL_REQUEST ADD CONSTRAINT IDX_PULL_REQUEST_PK PRIMARY KEY (USER_NAME, REPOSITORY_NAME, ISSUE_ID);
 ALTER TABLE PULL_REQUEST ADD CONSTRAINT IDX_PULL_REQUEST_FK0 FOREIGN KEY (USER_NAME, REPOSITORY_NAME, ISSUE_ID) REFERENCES ISSUE (USER_NAME, REPOSITORY_NAME, ISSUE_ID);
---ALTER TABLE PULL_REQUEST ADD CONSTRAINT IDX_PULL_REQUEST_FK1 FOREIGN KEY (REQUEST_USER_NAME, REQUEST_REPOSITORY_NAME) REFERENCES REPOSITORY (USER_NAME, REPOSITORY_NAME);
 
 ALTER TABLE ISSUE ADD COLUMN PULL_REQUEST BOOLEAN NOT NULL DEFAULT FALSE;