diff --git a/src/containers/blocks.jsx b/src/containers/blocks.jsx
index eaa4ee79a..ecb998ea4 100644
--- a/src/containers/blocks.jsx
+++ b/src/containers/blocks.jsx
@@ -85,7 +85,6 @@ class Blocks extends React.Component {
         this.toolboxUpdateQueue = [];
     }
     componentDidMount () {
-        window.vm = this.props.vm;
         this.ScratchBlocks.FieldColourSlider.activateEyedropper_ = this.props.onActivateColorPicker;
         this.ScratchBlocks.Procedures.externalProcedureDefCallback = this.props.onActivateCustomProcedures;
         this.ScratchBlocks.ScratchMsgs.setLocale(this.props.locale);