diff --git a/OvmfPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml b/OvmfPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
index a47d273217..df6a62cd61 100644
--- a/OvmfPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
+++ b/OvmfPkg/PlatformCI/.azurepipelines/Ubuntu-GCC5.yml
@@ -17,7 +17,7 @@ jobs:
   - job: Platform_CI
     variables:
       package: 'OvmfPkg'
-      vm_image: 'ubuntu-latest'
+      vm_image: 'ubuntu-18.04'
       should_run: true
       run_flags: "MAKE_STARTUP_NSH=TRUE QEMU_HEADLESS=TRUE"