diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 5451c7d25..d7ad907fd 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -3,4 +3,4 @@
 [toolchain]
 channel = "nightly-2021-08-18"
 components = [ "rust-src", "rustfmt" ]
-targets = [ "thumbv7em-none-eabi", "thumbv6m-none-eabi", "thumbv7em-none-eabihf" ]
+targets = [ "thumbv7em-none-eabi", "thumbv6m-none-eabi", "thumbv7em-none-eabihf", "wasm32-unknown-unknown" ]