diff --git a/eduserver/eduserver.go b/eduserver/eduserver.go
index 748a1260..40dfcdeb 100644
--- a/eduserver/eduserver.go
+++ b/eduserver/eduserver.go
@@ -52,7 +52,7 @@ func NewInternalAPI(
 		OutputTypingEventTopic:       cfg.Matrix.Kafka.TopicFor(config.TopicOutputTypingEvent),
 		OutputSendToDeviceEventTopic: cfg.Matrix.Kafka.TopicFor(config.TopicOutputSendToDeviceEvent),
 		OutputReceiptEventTopic:      cfg.Matrix.Kafka.TopicFor(config.TopicOutputReceiptEvent),
-		OutputSigningKeyUpdateTopic:  cfg.Matrix.Kafka.TopicFor(config),
+		OutputSigningKeyUpdateTopic:  cfg.Matrix.Kafka.TopicFor(config.TopicOutputSigningKeyUpdate),
 		ServerName:                   cfg.Matrix.ServerName,
 	}
 }