diff --git a/add-event.go b/add-event.go
index 43041cb..075c6f0 100644
--- a/add-event.go
+++ b/add-event.go
@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 
+	"github.com/fiatjaf/eventstore"
 	"github.com/nbd-wtf/go-nostr"
 )
 
@@ -66,7 +67,7 @@ func (rl *Relay) AddEvent(ctx context.Context, evt *nostr.Event) error {
 		for _, store := range rl.StoreEvent {
 			if saveErr := store(ctx, evt); saveErr != nil {
 				switch saveErr {
-				case ErrDupEvent:
+				case eventstore.ErrDupEvent:
 					return nil
 				default:
 					errmsg := saveErr.Error()
diff --git a/errors.go b/errors.go
deleted file mode 100644
index 8514fb8..0000000
--- a/errors.go
+++ /dev/null
@@ -1,5 +0,0 @@
-package khatru
-
-import "fmt"
-
-var ErrDupEvent = fmt.Errorf("duplicate: event already exists")