diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
index 3a24be139d..932352c0f0 100644
--- a/.github/actions/setup/action.yml
+++ b/.github/actions/setup/action.yml
@@ -114,11 +114,15 @@ runs:
       if: ${{ inputs.os == 'macOS' || inputs.os == 'Android' }}
       uses: dtolnay/rust-toolchain@stable
 
-      # TODO: Remove once `imports_granularity` rustfmt option is stable. https://rust-lang.github.io/rustfmt/?version=v1.9.0&search=group#imports_granularity
-    - name: 'Install Nightly Rust toolchain for linting'
+      # Avoid 'rustup toolchain install nightly'. When a newer nightly is published, it triggers an in-place toolchain
+      # update whose component swap renames files from /opt/rustup/toolchains/ to /opt/rustup/tmp/. And those land on
+      # different overlayfs mounts inside the runner container — producing "Invalid cross-device link (os error 18)".
+      # TODO: Remove once 'imports_granularity' rustfmt option is stable:
+      #       https://rust-lang.github.io/rustfmt/?version=v1.9.0&search=group#imports_granularity
+    - name: 'Ensure rustfmt is available on the nightly toolchain'
       if: ${{ inputs.type == 'lint' }}
       shell: bash
-      run: rustup toolchain install nightly --component rustfmt
+      run: rustup component add rustfmt --toolchain nightly
 
     - name: 'Install wasm-tools'
       if: ${{ inputs.type == 'build' }}