diff --git a/cargo-n64/rust-toolchain b/cargo-n64/rust-toolchain
new file mode 100644
index 0000000..05d4932
--- /dev/null
+++ b/cargo-n64/rust-toolchain
@@ -0,0 +1 @@
+nightly-2021-08-07
diff --git a/cargo-n64/src/cargo.rs b/cargo-n64/src/cargo.rs
index 28c337c..d11cdaf 100644
--- a/cargo-n64/src/cargo.rs
+++ b/cargo-n64/src/cargo.rs
@@ -86,7 +86,7 @@ pub(crate) fn run(args: &cli::BuildArgs, verbose: usize) -> Result<CargoArtifact
     };
 
     let output = Command::new("cargo")
-        .arg(format!("+{}", include_str!("../../rust-toolchain").trim()))
+        .arg(format!("+{}", include_str!("../rust-toolchain").trim()))
         .arg("build")
         .arg("-Z=build-std=core,alloc")
         .arg("--message-format=json-render-diagnostics")