diff --git a/plugins/docker/docker_ b/plugins/docker/docker_
index 7bfe94dd..f1ba4307 100755
--- a/plugins/docker/docker_
+++ b/plugins/docker/docker_
@@ -293,7 +293,7 @@ def print_containers_network(client):
 def volume_summary(volume):
     summary = f"{volume.short_id}"
     if volume.attrs['Labels']:
-        summary += " ({', '.join(volume.attrs['Labels'])})"
+        summary += f" ({', '.join(volume.attrs['Labels'])})"
     return summary