diff --git a/.github/workflows/workspace.yml b/.github/workflows/workspace.yml
index 35d32bfab..80838dfbd 100644
--- a/.github/workflows/workspace.yml
+++ b/.github/workflows/workspace.yml
@@ -30,7 +30,7 @@ jobs:
     - name: custom backend
       env:
         RUSTFLAGS: -Dwarnings --cfg getrandom_backend="custom"
-      run: cargo clippy -Zbuild-std=core --target riscv32i-unknown-none-elf
+      run: cargo clippy -Zbuild-std=core --target riscv32i-unknown-none-elf --features=opt_in
     - name: iOS (apple-other.rs)
       run: cargo clippy -Zbuild-std=core --target x86_64-apple-ios
     - name: ESP-IDF (espidf.rs)