diff --git a/scripts/opax.sh b/scripts/opax.sh
index 7a2a487..d69e587 100644
--- a/scripts/opax.sh
+++ b/scripts/opax.sh
@@ -68,7 +68,7 @@ if [[ -z "${OPAX_LOADED-}" ]]; then
               true
 
     run_check "Application Default Credentials (ADC)" \
-              "gcloud auth application-default print-access-token --quiet" \
+              "curl -sf -H 'Metadata-Flavor: Google' 'http://metadata.google.internal/computeMetadata/v1/instance/service-accounts/default/token' | grep -q access_token || gcloud auth application-default print-access-token --quiet" \
               "Run: gcloud auth application-default login" \
               true