diff --git a/backend/src/activitypub/actors/index.ts b/backend/src/activitypub/actors/index.ts
index fa8dc69..0d5f574 100644
--- a/backend/src/activitypub/actors/index.ts
+++ b/backend/src/activitypub/actors/index.ts
@@ -225,7 +225,7 @@ export async function updateActorProperty(db: Database, actorId: URL, key: strin
 
 export async function setActorAlias(db: Database, actorId: URL, alias: URL) {
 	const { success, error } = await db
-		.prepare(`UPDATE actors SET properties=json_set(properties, '$.alsoKnownAs', json_array(?)) WHERE id=?`)
+		.prepare(`UPDATE actors SET properties=json_set(properties, '$.alsoKnownAs', ${db.qb.jsonArray('?1')}) WHERE id=?2`)
 		.bind(alias.toString(), actorId.toString())
 		.run()
 	if (!success) {
diff --git a/backend/src/database/d1.ts b/backend/src/database/d1.ts
index ba6af22..440b516 100644
--- a/backend/src/database/d1.ts
+++ b/backend/src/database/d1.ts
@@ -25,6 +25,10 @@ const qb: QueryBuilder = {
 	psqlOnly(): string {
 		return ''
 	},
+
+	jsonArray(r: string): string {
+		return `json_array(${r})`
+	},
 }
 
 export default function make({ DATABASE }: Pick<Env, 'DATABASE'>): Database {
diff --git a/backend/src/database/index.ts b/backend/src/database/index.ts
index edcc402..a43cb6e 100644
--- a/backend/src/database/index.ts
+++ b/backend/src/database/index.ts
@@ -33,6 +33,7 @@ export interface QueryBuilder {
 	epoch(): string
 	insertOrIgnore(q: string): string
 	psqlOnly(raw: string): string
+	jsonArray(r: string): string
 }
 
 export async function getDatabase(env: Pick<Env, 'DATABASE' | 'NEON_DATABASE_URL'>): Promise<Database> {
diff --git a/backend/src/database/neon.ts b/backend/src/database/neon.ts
index 6e7e715..80661f1 100644
--- a/backend/src/database/neon.ts
+++ b/backend/src/database/neon.ts
@@ -34,6 +34,10 @@ const qb: QueryBuilder = {
 	psqlOnly(q: string): string {
 		return q
 	},
+
+	jsonArray(r: string): string {
+		return `json_array_elements_text(${r})`
+	},
 }
 
 export default async function make(env: Pick<Env, 'NEON_DATABASE_URL'>): Promise<Database> {