diff --git a/.github/workflows/validate-header-guards.yml b/.github/workflows/validate-header-guards.yml
index ad70bcd2..c02b5d49 100644
--- a/.github/workflows/validate-header-guards.yml
+++ b/.github/workflows/validate-header-guards.yml
@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   build:
     # Set the type of machine to run on
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
 
       - name: Checkout source code