diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b595c7e9..e1fd549e 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,6 +13,7 @@ jobs:
           - freebsd
           - ios
           - linux
+          - plan9
           - windows
         goarch:
           - amd64