diff --git a/src/service/migrations.rs b/src/service/migrations.rs
index 126d3c7e..cded9bce 100644
--- a/src/service/migrations.rs
+++ b/src/service/migrations.rs
@@ -14,7 +14,7 @@ use itertools::Itertools;
 use ruma::{
 	events::{push_rules::PushRulesEvent, room::member::MembershipState, GlobalAccountDataEventType},
 	push::Ruleset,
-	OwnedUserId, UserId,
+	OwnedUserId, RoomId, UserId,
 };
 
 use crate::{media, Services};
@@ -69,6 +69,7 @@ async fn fresh(services: &Services) -> Result<()> {
 	db["global"].insert(b"fix_bad_double_separator_in_state_cache", []);
 	db["global"].insert(b"retroactively_fix_bad_data_from_roomuserid_joined", []);
 	db["global"].insert(b"fix_referencedevents_missing_sep", []);
+	db["global"].insert(b"fix_readreceiptid_readreceipt_duplicates", []);
 
 	// Create the admin room and server user on first run
 	crate::admin::create_admin_room(services).boxed().await?;
@@ -130,6 +131,14 @@ async fn migrate(services: &Services) -> Result<()> {
 		fix_referencedevents_missing_sep(services).await?;
 	}
 
+	if db["global"]
+		.get(b"fix_readreceiptid_readreceipt_duplicates")
+		.await
+		.is_not_found()
+	{
+		fix_readreceiptid_readreceipt_duplicates(services).await?;
+	}
+
 	let version_match = services.globals.db.database_version().await == DATABASE_VERSION
 		|| services.globals.db.database_version().await == CONDUIT_DATABASE_VERSION;
 
@@ -493,3 +502,53 @@ async fn fix_referencedevents_missing_sep(services: &Services) -> Result {
 	db["global"].insert(b"fix_referencedevents_missing_sep", []);
 	db.db.cleanup()
 }
+
+async fn fix_readreceiptid_readreceipt_duplicates(services: &Services) -> Result {
+	use ruma::identifiers_validation::MAX_BYTES;
+	type ArrayId = arrayvec::ArrayString<MAX_BYTES>;
+	type Key<'a> = (&'a RoomId, u64, &'a UserId);
+
+	warn!("Fixing undeleted entries in readreceiptid_readreceipt...");
+
+	let db = &services.db;
+	let cork = db.cork_and_sync();
+	let readreceiptid_readreceipt = db["readreceiptid_readreceipt"].clone();
+
+	let mut cur_room: Option<ArrayId> = None;
+	let mut cur_user: Option<ArrayId> = None;
+	let (mut total, mut fixed): (usize, usize) = (0, 0);
+	readreceiptid_readreceipt
+		.keys()
+		.expect_ok()
+		.ready_for_each(|key: Key<'_>| {
+			let (room_id, _, user_id) = key;
+			let last_room = cur_room.replace(
+				room_id
+					.as_str()
+					.try_into()
+					.expect("invalid room_id in database"),
+			);
+
+			let last_user = cur_user.replace(
+				user_id
+					.as_str()
+					.try_into()
+					.expect("invalid user_id in database"),
+			);
+
+			let is_dup = cur_room == last_room && cur_user == last_user;
+			if is_dup {
+				readreceiptid_readreceipt.del(key);
+			}
+
+			fixed = fixed.saturating_add(is_dup.into());
+			total = total.saturating_add(1);
+		})
+		.await;
+
+	drop(cork);
+	info!(?total, ?fixed, "Fixed undeleted entries in readreceiptid_readreceipt.");
+
+	db["global"].insert(b"fix_readreceiptid_readreceipt_duplicates", []);
+	db.db.cleanup()
+}