diff --git a/screening/source/sql/imaging/postgresql/migration/migration-017-018.sql b/screening/source/sql/imaging/postgresql/migration/migration-017-018.sql
index 393f58d833643a4b1e14e492c4aa46d48a7d7ed7..6c7743f6d82586fc51d347d73184054e531fe25a 100644
--- a/screening/source/sql/imaging/postgresql/migration/migration-017-018.sql
+++ b/screening/source/sql/imaging/postgresql/migration/migration-017-018.sql
@@ -1,3 +1,3 @@
 -- Migration from 017 to 018
 
-ALTER TABLE ACQUIRED_IMAGES DROP CONSTRAINT FK_IMAGES_IMG_OR_THUMB_ARC_CK;
+ALTER TABLE ACQUIRED_IMAGES DROP CONSTRAINT IF EXISTS FK_IMAGES_IMG_OR_THUMB_ARC_CK;