diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 0b57022b3..be5184651 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
-channel    = "1.77.0"
-components = ["rustfmt", "clippy"]
+channel = "1.77.0"
+components = ["rustfmt", "clippy", "rust-src"]
 targets = ["wasm32-unknown-unknown"]