diff --git a/.github/workflows/packaging.yml b/.github/workflows/packaging.yml
index 6b4b97d..17b1b0e 100644
--- a/.github/workflows/packaging.yml
+++ b/.github/workflows/packaging.yml
@@ -6,6 +6,11 @@ on:
     pull_request:
         branches: [ main ]
 
+defaults:
+    run:
+        # See https://github.com/mamba-org/provision-with-micromamba#important
+        shell: bash -l {0}
+
 jobs:
     conda:
         name: "Install from conda-forge"