diff --git a/.gitea/workflows/check-flake.yaml b/.gitea/workflows/check-flake.yaml
index d49820e..40dcf6e 100644
--- a/.gitea/workflows/check-flake.yaml
+++ b/.gitea/workflows/check-flake.yaml
@@ -5,6 +5,10 @@ on: [push]
 env:
   DEBIAN_FRONTEND: noninteractive
 
+defaults:
+  run:
+    shell: sh
+
 jobs:
   check-flake:
     runs-on: NixOS