diff --git a/.github/workflows/toolchain.yml b/.github/workflows/toolchain.yml
index 4bb761af68..65144b1fc8 100644
--- a/.github/workflows/toolchain.yml
+++ b/.github/workflows/toolchain.yml
@@ -29,6 +29,7 @@ jobs:
             echo "::error file=rust-toolchain.toml::failed to parse rust-toolchain.toml"
             exit 1
           fi
+        shell: bash
 
 
   workflows: