diff --git a/src/matrix.coffee b/src/matrix.coffee
index 3fe74d7..8060c43 100644
--- a/src/matrix.coffee
+++ b/src/matrix.coffee
@@ -36,7 +36,7 @@ class Matrix extends Adapter
 
   topic: (envelope, strings...) ->
     for str in strings
-      @sendEvent envelope.room, "m.room.topic", {
+      @client.sendEvent envelope.room, "m.room.topic", {
         topic: str
       }