diff --git a/app/app.js b/app/app.js
index 98831c8..d85d9c5 100644
--- a/app/app.js
+++ b/app/app.js
@@ -374,8 +374,8 @@
           <Keyboard
             w={w}
             h={h}
-            noteon={this.noteon}
-            noteoff={this.noteoff}
+            noteon={this.noteon.bind(this)}
+            noteoff={this.noteoff.bind(this)}
             showMidi={showMidi}
             layout={layouts[layout]}
             scale={scale !== "none" && offset !== null && tallyup(scales[scale], offset)}