diff --git a/taskcluster/fenix_taskgraph/transforms/browsertime.py b/taskcluster/fenix_taskgraph/transforms/browsertime.py
index 768368007..e23fb3403 100644
--- a/taskcluster/fenix_taskgraph/transforms/browsertime.py
+++ b/taskcluster/fenix_taskgraph/transforms/browsertime.py
@@ -160,7 +160,7 @@ def setup_nofis(config, tasks):
 
         # Build taskcluster group and symol
         task["treeherder"]["symbol"].replace("Btime", "Btime-nofis")
-        task["name"].append("-nofis")
+        task["name"] += ("-nofis")
 
         yield task