We present Wasm_of_ocaml, a fork of the Js_of_ocaml compiler, that translates OCaml bytecode to WebAssembly rather than to JavaScript. Wasm_of_ocaml builds on the WebAssembly garbage collection extension, now available by default in the Chrome and Firefox browsers. This avoids having to reimplement a GC and allows for good JavaScript interoperability. Overall Wasm_of_ocaml offers a performance boost over Js_of_ocaml of up to 2x or more, and requires only minimal source code changes to port a program.