diff --git a/serverkeyapi/storage/sqlite3/keydb.go b/serverkeyapi/storage/sqlite3/keydb.go
index d1dc61c9..1ad6e7e8 100644
--- a/serverkeyapi/storage/sqlite3/keydb.go
+++ b/serverkeyapi/storage/sqlite3/keydb.go
@@ -17,6 +17,8 @@ package sqlite3
 
 import (
 	"context"
+	"errors"
+	"net/url"
 	"time"
 
 	"golang.org/x/crypto/ed25519"
@@ -44,7 +46,19 @@ func NewDatabase(
 	serverKey ed25519.PublicKey,
 	serverKeyID gomatrixserverlib.KeyID,
 ) (*Database, error) {
-	db, err := sqlutil.Open(internal.SQLiteDriverName(), dataSourceName, nil)
+	uri, err := url.Parse(dataSourceName)
+	if err != nil {
+		return nil, err
+	}
+	var cs string
+	if uri.Opaque != "" { // file:filename.db
+		cs = uri.Opaque
+	} else if uri.Path != "" { // file:///path/to/filename.db
+		cs = uri.Path
+	} else {
+		return nil, errors.New("no filename or path in connect string")
+	}
+	db, err := sqlutil.Open(internal.SQLiteDriverName(), cs, nil)
 	if err != nil {
 		return nil, err
 	}