diff --git a/addon/thanos/templates/_helpers.tpl b/addon/thanos/templates/_helpers.tpl
index 48a4c8d1001de670ce90c815efcea7a6e2628f33..6b1ce93483c24f17286838b00ddef2f2114eada2 100644
--- a/addon/thanos/templates/_helpers.tpl
+++ b/addon/thanos/templates/_helpers.tpl
@@ -9,7 +9,7 @@ The longest name that gets created adds and extra 37 characters, so truncation s
 {{- if .Values.fullnameOverride -}}
 {{- .Values.fullnameOverride | trunc 26 | trimSuffix "-" -}}
 {{- else -}}
-{{- $name := default .Chart.Name .Values.nameOverride -}}
+{{- $name := default "kube-prometheus-stack" .Values.nameOverride -}}
 {{- if contains $name .Release.Name -}}
 {{- .Release.Name | trunc 26 | trimSuffix "-" -}}
 {{- else -}}