diff --git a/google-cloud-firestore/acceptance/firestore/service_test.rb b/google-cloud-firestore/acceptance/firestore/service_test.rb
index 3a09568f4328..74cc85a30cea 100644
--- a/google-cloud-firestore/acceptance/firestore/service_test.rb
+++ b/google-cloud-firestore/acceptance/firestore/service_test.rb
@@ -20,7 +20,7 @@
 describe Google::Cloud::Firestore::Service, :firestore_acceptance do
   let :config_metadata do
     {
-      "google-cloud-resource-prefix": "projects/#{firestore.project_id}/databases/(default)"
+      "x-goog-request-params": "projects/#{firestore.project_id}/databases/(default)"
     }
   end
 
diff --git a/google-cloud-firestore/lib/google/cloud/firestore/service.rb b/google-cloud-firestore/lib/google/cloud/firestore/service.rb
index c12b2ac24824..bdb651521e16 100644
--- a/google-cloud-firestore/lib/google/cloud/firestore/service.rb
+++ b/google-cloud-firestore/lib/google/cloud/firestore/service.rb
@@ -52,7 +52,7 @@ def firestore
               config.endpoint = host if host
               config.lib_name = "gccl"
               config.lib_version = Google::Cloud::Firestore::VERSION
-              config.metadata = { "google-cloud-resource-prefix": "projects/#{@project}/databases/#{@database}" }
+              config.metadata = { "x-goog-request-params": "projects/#{@project}/databases/#{@database}" }
             end
           end
         end