diff --git a/action.yml b/action.yml
index 7320b86..508d4c6 100644
--- a/action.yml
+++ b/action.yml
@@ -93,6 +93,12 @@ branding:
 runs:
   using: composite
   steps:
+  - name: Fail-fast in unsupported environments
+    if: runner.os != 'Linux'
+    run: |
+      >&2 echo This action is only able to run under GNU/Linux environments
+      exit 1
+    shell: bash -eEuo pipefail {0}
   - name: Reset path if needed
     run: |
       # Reset path if needed