diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 41949c0..64a1ba5 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -35,8 +35,8 @@ jobs:
         run: |
           cargo doc --release
           cargo doc --no-default-features --features no-std
-          RUSTDOCFLAGS="--cfg lsps1" cargo doc --release
-          RUSTDOCFLAGS="--cfg lsps1" cargo doc --no-default-features --features no-std
+          RUSTFLAGS="--cfg lsps1" RUSTDOCFLAGS="--cfg lsps1" cargo doc --release
+          RUSTFLAGS="--cfg lsps1" RUSTDOCFLAGS="--cfg lsps1" cargo doc --no-default-features --features no-std
       - name: Build on Rust ${{ matrix.toolchain }}
         run: cargo build --verbose --color always
       - name: Check formatting