diff --git a/.github/workflows/build-test.yml b/.github/workflows/build-test.yml
index 9371ed79b..763d1f8f9 100644
--- a/.github/workflows/build-test.yml
+++ b/.github/workflows/build-test.yml
@@ -142,6 +142,7 @@ jobs:
 
     # Test cldb output both run from python and via its command line tool.
     - name: "Run step run tests"
+      shell: bash
       run: |
         . ./activate
         cargo build