diff --git a/src/brush.js b/src/brush.js
index 792dfa0..d920536 100644
--- a/src/brush.js
+++ b/src/brush.js
@@ -323,7 +323,7 @@ function brush(dim) {
           sourceEvent: event,
           target: brush,
           selection: dim.output(this.state.selection),
-          mode: mode,
+          mode,
           dispatch: listeners
         }),
         d