diff --git a/rust-toolchain.toml b/rust-toolchain.toml
index 92e4674..e7271fd 100644
--- a/rust-toolchain.toml
+++ b/rust-toolchain.toml
@@ -1,4 +1,4 @@
 [toolchain]
 channel = "nightly"
-components = [ "llvm-tools-preview" ]
+components = [ "llvm-tools-preview", "rust-src" ]
 profile = "minimal"