diff --git a/app/elements/kano-workspace-camera/kano-workspace-camera.html b/app/elements/kano-workspace-camera/kano-workspace-camera.html
index da29d3818..5b9a0428c 100644
--- a/app/elements/kano-workspace-camera/kano-workspace-camera.html
+++ b/app/elements/kano-workspace-camera/kano-workspace-camera.html
@@ -213,7 +213,7 @@
                 this._stopWebcam();
             },
             renderBlank () {
-                ctx = this.$.canvas.getContext('2d');
+                let ctx = this.$.canvas.getContext('2d');
                 ctx.fillStyle = '#ffffff';
                 ctx.clearRect(0, 0, this.$.canvas.width, this.$.canvas.height);
             },