diff --git a/values/overrides.yaml b/values/overrides.yaml
index f1967ba..1a5d04f 100644
--- a/values/overrides.yaml
+++ b/values/overrides.yaml
@@ -4150,7 +4150,7 @@ prometheus:
 
     ## Maximum size of metrics
     ##
-    retentionSize: ""
+    retentionSize: "14GiB"
 
     ## Allow out-of-order/out-of-bounds samples ingested into Prometheus for a specified duration
     ## See https://prometheus.io/docs/prometheus/latest/configuration/configuration/#tsdb