diff --git a/.github/workflows/nix_integration_tests.yaml b/.github/workflows/nix_integration_tests.yaml
index 4da36ec8..e480ba62 100644
--- a/.github/workflows/nix_integration_tests.yaml
+++ b/.github/workflows/nix_integration_tests.yaml
@@ -38,7 +38,8 @@ jobs:
         export NCCL_P2P_DISABLE=1
         sudo find $NVIDIA . -name 'libcuda.so*' -exec ln -s {} /run/opengl-driver/lib/ \;
         sudo find $NVIDIA . -name 'libnvidia-ml.so*' -exec ln -s {} /run/opengl-driver/lib/ \;
-        nix develop .#test --command pytest -svvx integration-tests/ --release
+        nix develop .#test --command pytest -svvx integration-tests/models/test_bloom_560m.py::test_bloom_560m_all_params --release
+        # nix develop .#test --command pytest -svvx integration-tests/ --release
       env:
         HF_TOKEN: ${{ secrets.HF_TOKEN }}
         HF_HOME: /mnt/hf_cache/
diff --git a/integration-tests/conftest.py b/integration-tests/conftest.py
index 83ba2d71..bcc4342c 100644
--- a/integration-tests/conftest.py
+++ b/integration-tests/conftest.py
@@ -456,6 +456,12 @@ def launcher(event_loop):
             args.append("--disable-grammar-support")
         if num_shard is not None:
             args.extend(["--num-shard", str(num_shard)])
+        else:
+            try:
+                os.environ["WORLD_SIZE"] = 1
+                del os.environ["NUM_SHARD"]
+            except Exception:
+                pass
         if quantize is not None:
             args.append("--quantize")
             args.append(quantize)