diff --git a/.github/workflows/testinparallel.yml b/.github/workflows/testinparallel.yml
index 7a6e29474..04abaa421 100644
--- a/.github/workflows/testinparallel.yml
+++ b/.github/workflows/testinparallel.yml
@@ -7,7 +7,7 @@ on:
 
 defaults:
   run:
-    shell: bash
+    shell: sh
 
 jobs:
   test-suite: