diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 94234e4..f2f4bd1 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -35,7 +35,7 @@ jobs:
       - name: Set nightly flags (nightly only)
         if: ${{ matrix.version == 'nightly' }}
         run: |
-          echo "RUSTFLAGS=-Zinstrument-coverage" >> $GITHUB_ENV
+          echo "RUSTFLAGS=-Cinstrument-coverage" >> $GITHUB_ENV
           echo "LLVM_PROFILE_FILE=tasshi-me-%p-%m.profraw" >> $GITHUB_ENV
 
       - name: Rustup version