diff --git a/cmd/tusd/cli/flags.go b/cmd/tusd/cli/flags.go
index b4e713a..5e80efb 100644
--- a/cmd/tusd/cli/flags.go
+++ b/cmd/tusd/cli/flags.go
@@ -18,6 +18,7 @@ var Flags struct {
 	S3ObjectPrefix    string
 	S3Endpoint        string
 	GCSBucket         string
+	GCSObjectPrefix   string
 	FileHooksDir      string
 	HttpHooksEndpoint string
 	HttpHooksRetry    int
@@ -44,6 +45,7 @@ func ParseFlags() {
 	flag.StringVar(&Flags.S3ObjectPrefix, "s3-object-prefix", "", "Prefix for S3 object names")
 	flag.StringVar(&Flags.S3Endpoint, "s3-endpoint", "", "Endpoint to use S3 compatible implementations like minio (requires s3-bucket to be pass)")
 	flag.StringVar(&Flags.GCSBucket, "gcs-bucket", "", "Use Google Cloud Storage with this bucket as storage backend (requires the GCS_SERVICE_ACCOUNT_FILE environment variable to be set)")
+	flag.StringVar(&Flags.GCSObjectPrefix, "gcs-object-prefix", "", "Prefix for GCS object names")
 	flag.StringVar(&Flags.FileHooksDir, "hooks-dir", "", "Directory to search for available hooks scripts")
 	flag.StringVar(&Flags.HttpHooksEndpoint, "hooks-http", "", "An HTTP endpoint to which hook events will be sent to")
 	flag.IntVar(&Flags.HttpHooksRetry, "hooks-http-retry", 3, "Number of times to retry on a 500 or network timeout")