diff --git a/.github/workflows/ubuntu20.yml b/.github/workflows/ubuntu20.yml
index 2bbd973..88c09ba 100644
--- a/.github/workflows/ubuntu20.yml
+++ b/.github/workflows/ubuntu20.yml
@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 jobs:
   ubuntu-build:
-    runs-on: ubuntu-20.04                      , arch: -DCMAKE_CXX_FLAGS="-m32"} # default=gcc9
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Use cmake