diff --git a/ingest/ingest.go b/ingest/ingest.go
index 2af7c98..1be0808 100644
--- a/ingest/ingest.go
+++ b/ingest/ingest.go
@@ -60,7 +60,7 @@ func Ingest(o IngestOpts) error {
 			id SERIAL PRIMARY KEY,
 			sourceid char(7) NOT NULL,
 			phrase TEXT,
-			FOREIGN KEY (sourceid) REFERENCES sources(id)
+			FOREIGN KEY (sourceid) REFERENCES sources(id) ON DELETE CASCADE
 		)`, tablename))
 	if err != nil {
 		return fmt.Errorf("could not create table '%s': %w", tablename, err)
diff --git a/phrasedb.sql b/phrasedb.sql
index 3d3cb94..1d438f0 100644
--- a/phrasedb.sql
+++ b/phrasedb.sql
@@ -14,7 +14,7 @@ CREATE TABLE IF NOT EXISTS sources (
   corpusid char(7) NOT NULL,
   name     TEXT UNIQUE,
 
-  FOREIGN KEY (corpusid) REFERENCES corpora(id)
+  FOREIGN KEY (corpusid) REFERENCES corpora(id) ON DELETE CASCADE
 );
 
 -- CREATE TABLE IF NOT EXISTS phrases (