diff --git a/models/authorship-statements.model b/models/authorship-statements.model
index b93afcd06..cc1cb32a1 100644
--- a/models/authorship-statements.model
+++ b/models/authorship-statements.model
@@ -6,7 +6,7 @@ AuthorshipStatementDefinition
 
 AuthorshipStatementSubmission
     statement AuthorshipStatementDefinitionId
-    submission SubmissionId
+    submission SubmissionId OnDeleteCascade OnUpdateCascade
     user UserId
     time UTCTime
     deriving Generic