diff --git a/.buckconfig.oss b/.buckconfig.oss
index 6a214726272fd6..b4012a1e10ad27 100644
--- a/.buckconfig.oss
+++ b/.buckconfig.oss
@@ -14,6 +14,7 @@
 
 [cxx]
   cxxflags = -std=c++17
+  ldflags = -Wl,--no-undefined
   should_remap_host_platform = true
   cpp = /usr/bin/clang
   cc = /usr/bin/clang
diff --git a/.github/workflows/_buck-build-test.yml b/.github/workflows/_buck-build-test.yml
index 0f571302b1f0c1..12860bbd1c868e 100644
--- a/.github/workflows/_buck-build-test.yml
+++ b/.github/workflows/_buck-build-test.yml
@@ -73,7 +73,7 @@ jobs:
           timeout_minutes: 10
           max_attempts: 5
           command: |
-            sh scripts/buck_setup.sh
+            bash scripts/buck_setup.sh
 
       - name: Build tools
         run: |
@@ -122,3 +122,7 @@ jobs:
       - name: Build everything
         run: |
           buck build //... --keep-going
+
+      - name: Build aten_cpu@shared
+        run: |
+          buck build :aten_cpu#linux-x86_64,shared