diff --git a/.forgejo/workflows/validate.yaml b/.forgejo/workflows/validate.yaml
index 8145e36..c018a97 100644
--- a/.forgejo/workflows/validate.yaml
+++ b/.forgejo/workflows/validate.yaml
@@ -6,6 +6,9 @@ on:
 jobs:
   validate:
     runs-on: docker
+    defaults:
+      run:
+        shell: sh
     steps:
       - name: Setup
         run: apk add bash