diff --git a/.github/workflows/build_pip.yaml b/.github/workflows/build_pip.yaml
index cf42049..2ec9d51 100644
--- a/.github/workflows/build_pip.yaml
+++ b/.github/workflows/build_pip.yaml
@@ -39,6 +39,7 @@ jobs:
       - name: Install MKL
         run: |
           mamba install -c conda-forge mkl-devel mkl-service --override-channels
+          mamba activate
           python -c "import sys; print(sys.executable)"
           which python
           python -c "import mkl; print(mkl.__file__)"