diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a0950158..d6e87eca 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -42,7 +42,7 @@ jobs:
           image_family: ubuntu-2004-lts
           machine_type: e2-highcpu-16
           disk_size: 100
-          machine_region: ${{GCP_ZONE}}
+          machine_region: ${{env.GCP_ZONE}}
           ephemeral: true
 
   test-features: