diff --git a/.github/workflows/rust.yml b/.github/workflows/rust.yml
index f9477ad2..e3cb1018 100644
--- a/.github/workflows/rust.yml
+++ b/.github/workflows/rust.yml
@@ -19,7 +19,9 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ ubuntu-latest, macos-latest ]
+        # tests with sanitizer on `ubuntu-latest` is supported by 
+        # self-defined `nihtly test` job, so we don't need to test it here.
+        os: [ macos-latest ]
     steps:
       - uses: actions/checkout@v2
         with:
@@ -50,14 +52,6 @@ jobs:
         env:
           RUST_BACKTRACE: 1
           EXTRA_CARGO_ARGS: '--verbose'
-      - name: Run asan tests
-        if: ${{ matrix.os == 'ubuntu-latest' }}
-        run: make test
-        env:
-          RUST_BACKTRACE: 1
-          RUSTFLAGS: '-Zsanitizer=address'
-          RUSTDOCFLAGS: '-Zsanitizer=address'
-          EXTRA_CARGO_ARGS: '--verbose -Zbuild-std --target x86_64-unknown-linux-gnu'
   stable:
     runs-on: ${{ matrix.os }}
     strategy: