Optimization causes TypeError not a function with a simple three.js dependency

I've created a simple test case that creates a three.js renderer and calls one function on loading (.setSize renderer 200 200)

When building with "lein cljsbuild once dev" everything works when the browser loads index.html.

But with "lein cljsbuild once min" an error occurs on loading:
"Uncaught TypeError: (intermediate value).bc is not a function"