diff --git a/shell.nix b/shell.nix
index 20ce061..325e61c 100644
--- a/shell.nix
+++ b/shell.nix
@@ -22,6 +22,7 @@ stdenv.mkDerivation {
   RUST_COMPILER_RT_ROOT = "${rustcSrc}/src/llvm-project/compiler-rt";
 
   shellHook = ''
+    cd firmware
     echo "Run 'cargo xbuild --release' to build."
   '';
 }