diff --git a/.github/workflows/illumos.yml b/.github/workflows/illumos.yml
index 0259bf1d5..0d4d5a3de 100644
--- a/.github/workflows/illumos.yml
+++ b/.github/workflows/illumos.yml
@@ -3,6 +3,7 @@ name: Illumos
 on:
   schedule:
     - cron: "0 0 25 * *"
+  workflow_dispatch:
 
 jobs:
   gcc: