diff --git a/.github/workflows/Linux_x86.yml b/.github/workflows/Linux_x86.yml
index bc8956d75..f59532386 100644
--- a/.github/workflows/Linux_x86.yml
+++ b/.github/workflows/Linux_x86.yml
@@ -9,7 +9,7 @@ on:
 
 jobs:
   build:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-18.04
     steps:
     - name: Checkout
       uses: actions/checkout@v2