diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index e978860..a2faced 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -39,6 +39,27 @@ jobs:
         path: bazel-disk
         key: bazel-disk-basic-${{matrix.compiler.name}}-${{matrix.mode.name}}-${{matrix.std.name}}-${{matrix.stdlib.name}}-${{matrix.feature.name}}-${{github.sha}}
 
+  compatible:
+    strategy:
+      fail-fast: false
+      matrix:
+        compiler: [{name: gcc-9, flag: --action_env=CC=gcc-9}]
+    runs-on: ubuntu-20.04
+    name: compatible-${{matrix.compiler.name}}
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions/cache/restore@v4
+      with:
+        path: bazel-disk
+        key: bazel-disk-compatible-${{matrix.compiler.name}}-${{github.sha}}
+        restore-keys: bazel-disk-compatible-${{matrix.compiler.name}}
+    - run: bazel test --disk_cache=bazel-disk --verbose_failures --test_output=errors ${{matrix.compiler.flag}} test/...
+    - uses: actions/cache/save@v4
+      if: always()
+      with:
+        path: bazel-disk
+        key: bazel-disk-basic-${{matrix.compiler.name}}-${{github.sha}}
+
   arenastring:
     strategy:
       fail-fast: false
diff --git a/src/babylon/concurrent/garbage_collector.h b/src/babylon/concurrent/garbage_collector.h
index dd480b3..d468e5f 100644
--- a/src/babylon/concurrent/garbage_collector.h
+++ b/src/babylon/concurrent/garbage_collector.h
@@ -59,7 +59,7 @@ class GarbageCollector {
  private:
   class ReclaimTask {
    public:
-    ReclaimTask() noexcept = default;
+    ReclaimTask() = default;
     ReclaimTask(ReclaimTask&&) = default;
     ReclaimTask(const ReclaimTask&) = delete;
     ReclaimTask& operator=(ReclaimTask&&) = default;
diff --git a/src/babylon/executor.h b/src/babylon/executor.h
index 70ee363..8199826 100644
--- a/src/babylon/executor.h
+++ b/src/babylon/executor.h
@@ -256,7 +256,7 @@ struct AlwaysUseNewThreadExecutor : public Executor {
 class ThreadPoolExecutor : public Executor {
  public:
   // Use **this** in worker thread, so no copy nor move
-  ThreadPoolExecutor() noexcept = default;
+  ThreadPoolExecutor() = default;
   ThreadPoolExecutor(ThreadPoolExecutor&&) noexcept = delete;
   ThreadPoolExecutor(const ThreadPoolExecutor&) noexcept = delete;
   ThreadPoolExecutor& operator=(ThreadPoolExecutor&&) noexcept = delete;