diff --git a/roomserver/storage/postgres/redactions_table.go b/roomserver/storage/postgres/redactions_table.go
index 289e1320f..42aba5985 100644
--- a/roomserver/storage/postgres/redactions_table.go
+++ b/roomserver/storage/postgres/redactions_table.go
@@ -39,7 +39,8 @@ CREATE INDEX IF NOT EXISTS roomserver_redactions_redacts_event_id ON roomserver_
 
 const insertRedactionSQL = "" +
 	"INSERT INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
-	" VALUES ($1, $2, $3)"
+	" VALUES ($1, $2, $3)" +
+	" ON CONFLICT DO NOTHING"
 
 const selectRedactionInfoByRedactionEventIDSQL = "" +
 	"SELECT redaction_event_id, redacts_event_id, validated FROM roomserver_redactions" +
diff --git a/roomserver/storage/sqlite3/redactions_table.go b/roomserver/storage/sqlite3/redactions_table.go
index a2179357c..e64714862 100644
--- a/roomserver/storage/sqlite3/redactions_table.go
+++ b/roomserver/storage/sqlite3/redactions_table.go
@@ -37,7 +37,7 @@ CREATE TABLE IF NOT EXISTS roomserver_redactions (
 `
 
 const insertRedactionSQL = "" +
-	"INSERT INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
+	"INSERT OR IGNORE INTO roomserver_redactions (redaction_event_id, redacts_event_id, validated)" +
 	" VALUES ($1, $2, $3)"
 
 const selectRedactionInfoByRedactionEventIDSQL = "" +