diff --git a/.github/workflows/test-py6s-conda-install-scheduled.yml b/.github/workflows/test-py6s-conda-install-scheduled.yml
index c51ba21..d757e3f 100644
--- a/.github/workflows/test-py6s-conda-install-scheduled.yml
+++ b/.github/workflows/test-py6s-conda-install-scheduled.yml
@@ -4,6 +4,7 @@ on:
     # * is a special character in YAML so you have to quote this string
     # at 07:14 on a Sunday
     - cron:  '14 7 * * 0'
+  workflow_dispatch:
 jobs:
   test-py6s:
     name: Test Py6S from conda install