diff --git a/api/src/api/accounts.js b/api/src/api/accounts.js
index ae3aeab..eeb25d7 100644
--- a/api/src/api/accounts.js
+++ b/api/src/api/accounts.js
@@ -31,6 +31,14 @@ module.exports = {
 			if (!utils.isURLValid(req.query.url))
 				return res.json({ error: 'invalid_url' })
 
+			const block = await db.table.objects().findOne({
+				object: apID(res.locals.user.username),
+				actor: req.query.url,
+				type: 'Block',
+			})
+			if (block !== null)
+				return res.json({ error: 'user_blocked_you' })
+
 			if (await getRejectedTimes(req, res) >= REJECT_TIMES_MAX)
 				return res.json({ error: 'follow_rejected_max' })