diff --git a/roomserver/internal/helpers/helpers.go b/roomserver/internal/helpers/helpers.go
index 30c4d8cdb..2653027e9 100644
--- a/roomserver/internal/helpers/helpers.go
+++ b/roomserver/internal/helpers/helpers.go
@@ -22,7 +22,7 @@ import (
 // Move these to a more sensible place.
 
 func UpdateToInviteMembership(
-	mu *shared.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
+	mu *shared.MembershipUpdater, add *types.Event, updates []api.OutputEvent,
 	roomVersion gomatrixserverlib.RoomVersion,
 ) ([]api.OutputEvent, error) {
 	// We may have already sent the invite to the user, either because we are
diff --git a/roomserver/internal/input/input_membership.go b/roomserver/internal/input/input_membership.go
index 7573b5cbf..1a14e3c6d 100644
--- a/roomserver/internal/input/input_membership.go
+++ b/roomserver/internal/input/input_membership.go
@@ -61,20 +61,14 @@ func (r *Inputer) updateMemberships(
 	var updates []api.OutputEvent
 
 	for _, change := range changes {
-		var ae *gomatrixserverlib.Event
-		var re *gomatrixserverlib.Event
+		var ae *types.Event
+		var re *types.Event
 		targetUserNID := change.EventStateKeyNID
 		if change.removedEventNID != 0 {
-			ev, _ := helpers.EventMap(events).Lookup(change.removedEventNID)
-			if ev != nil {
-				re = ev.Event
-			}
+			re, _ = helpers.EventMap(events).Lookup(change.removedEventNID)
 		}
 		if change.addedEventNID != 0 {
-			ev, _ := helpers.EventMap(events).Lookup(change.addedEventNID)
-			if ev != nil {
-				ae = ev.Event
-			}
+			ae, _ = helpers.EventMap(events).Lookup(change.addedEventNID)
 		}
 		if updates, err = r.updateMembership(updater, targetUserNID, re, ae, updates); err != nil {
 			return nil, err
@@ -86,7 +80,7 @@ func (r *Inputer) updateMemberships(
 func (r *Inputer) updateMembership(
 	updater *shared.RoomUpdater,
 	targetUserNID types.EventStateKeyNID,
-	remove, add *gomatrixserverlib.Event,
+	remove, add *types.Event, // *gomatrixserverlib.Event,
 	updates []api.OutputEvent,
 ) ([]api.OutputEvent, error) {
 	var err error
@@ -140,7 +134,7 @@ func (r *Inputer) updateMembership(
 	}
 }
 
-func (r *Inputer) isLocalTarget(event *gomatrixserverlib.Event) bool {
+func (r *Inputer) isLocalTarget(event *types.Event) bool {
 	isTargetLocalUser := false
 	if statekey := event.StateKey(); statekey != nil {
 		_, domain, _ := gomatrixserverlib.SplitID('@', *statekey)
@@ -150,7 +144,7 @@ func (r *Inputer) isLocalTarget(event *gomatrixserverlib.Event) bool {
 }
 
 func updateToJoinMembership(
-	mu *shared.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
+	mu *shared.MembershipUpdater, add *types.Event, updates []api.OutputEvent,
 ) ([]api.OutputEvent, error) {
 	// When we mark a user as being joined we will invalidate any invites that
 	// are active for that user. We notify the consumers that the invites have
@@ -175,7 +169,7 @@ func updateToJoinMembership(
 }
 
 func updateToLeaveMembership(
-	mu *shared.MembershipUpdater, add *gomatrixserverlib.Event,
+	mu *shared.MembershipUpdater, add *types.Event,
 	newMembership string, updates []api.OutputEvent,
 ) ([]api.OutputEvent, error) {
 	// When we mark a user as having left we will invalidate any invites that
@@ -201,7 +195,7 @@ func updateToLeaveMembership(
 }
 
 func updateToKnockMembership(
-	mu *shared.MembershipUpdater, add *gomatrixserverlib.Event, updates []api.OutputEvent,
+	mu *shared.MembershipUpdater, add *types.Event, updates []api.OutputEvent,
 ) ([]api.OutputEvent, error) {
 	if _, _, err := mu.Update(tables.MembershipStateKnock, add); err != nil {
 		return nil, err
diff --git a/roomserver/internal/perform/perform_invite.go b/roomserver/internal/perform/perform_invite.go
index c01471755..6d3b30394 100644
--- a/roomserver/internal/perform/perform_invite.go
+++ b/roomserver/internal/perform/perform_invite.go
@@ -145,7 +145,11 @@ func (r *Inviter) PerformInvite(
 	if err != nil {
 		return nil, fmt.Errorf("r.DB.MembershipUpdater: %w", err)
 	}
-	outputUpdates, err = helpers.UpdateToInviteMembership(updater, event.Unwrap(), outputUpdates, req.Event.RoomVersion)
+	ev := &types.Event{
+		EventNID: 0,
+		Event:    event.Unwrap(),
+	}
+	outputUpdates, err = helpers.UpdateToInviteMembership(updater, ev, outputUpdates, req.Event.RoomVersion)
 	if err != nil {
 		return nil, fmt.Errorf("updateToInviteMembership: %w", err)
 	}
diff --git a/roomserver/storage/shared/membership_updater.go b/roomserver/storage/shared/membership_updater.go
index b07712e9a..e984f79c5 100644
--- a/roomserver/storage/shared/membership_updater.go
+++ b/roomserver/storage/shared/membership_updater.go
@@ -8,6 +8,7 @@ import (
 	"github.com/matrix-org/dendrite/roomserver/storage/tables"
 	"github.com/matrix-org/dendrite/roomserver/types"
 	"github.com/matrix-org/gomatrixserverlib"
+	"github.com/sirupsen/logrus"
 )
 
 type MembershipUpdater struct {
@@ -94,7 +95,7 @@ func (u *MembershipUpdater) Delete() error {
 	return u.d.MembershipTable.DeleteMembership(u.ctx, u.txn, u.roomNID, u.targetUserNID)
 }
 
-func (u *MembershipUpdater) Update(newMembership tables.MembershipState, event *gomatrixserverlib.Event) (bool, []string, error) {
+func (u *MembershipUpdater) Update(newMembership tables.MembershipState, event *types.Event) (bool, []string, error) {
 	var inserted bool    // Did the query result in a membership change?
 	var retired []string // Did we retire any updates in the process?
 	return inserted, retired, u.d.Writer.Do(u.d.DB, u.txn, func(txn *sql.Tx) error {
@@ -102,15 +103,13 @@ func (u *MembershipUpdater) Update(newMembership tables.MembershipState, event *
 		if err != nil {
 			return fmt.Errorf("u.d.AssignStateKeyNID: %w", err)
 		}
-		eventID := event.EventID()
-		// It's possible the event isn't persisted, i.e. in the case of invites,
-		// so don't error if we can't find the event NID.
-		eventNIDs, _ := u.d.eventNIDs(u.ctx, u.txn, []string{eventID}, false)
-		inserted, err = u.d.MembershipTable.UpdateMembership(u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID, newMembership, eventNIDs[eventID], false)
+		inserted, err = u.d.MembershipTable.UpdateMembership(u.ctx, u.txn, u.roomNID, u.targetUserNID, senderUserNID, newMembership, event.EventNID, false)
+		logrus.Infof("XXX: Updating membership table room %d user %d membership %d event %d", u.roomNID, u.targetUserNID, newMembership, event.EventNID)
 		if err != nil {
 			return fmt.Errorf("u.d.MembershipTable.UpdateMembership: %w", err)
 		}
 		if !inserted {
+			logrus.Info("XXX: No change")
 			return nil
 		}
 		switch {