diff --git a/packages/google-cloud-bigquery-connection/src/v1/connection_service_client.ts b/packages/google-cloud-bigquery-connection/src/v1/connection_service_client.ts
index 0a68f598b1a..1a90fd7d751 100644
--- a/packages/google-cloud-bigquery-connection/src/v1/connection_service_client.ts
+++ b/packages/google-cloud-bigquery-connection/src/v1/connection_service_client.ts
@@ -140,6 +140,8 @@ export class ConnectionServiceClient {
     }
     if (!opts.fallback) {
       clientHeader.push(`grpc/${this._gaxGrpc.grpcVersion}`);
+    } else if (opts.fallback === 'rest') {
+      clientHeader.push(`rest/${this._gaxGrpc.grpcVersion}`);
     }
     if (opts.libName && opts.libVersion) {
       clientHeader.push(`${opts.libName}/${opts.libVersion}`);