diff --git a/converter/internal/prometheusconvert/component/relabel.go b/converter/internal/prometheusconvert/component/relabel.go
index de6ec420ec21..a3bee3c6b7dd 100644
--- a/converter/internal/prometheusconvert/component/relabel.go
+++ b/converter/internal/prometheusconvert/component/relabel.go
@@ -36,6 +36,7 @@ func toRelabelArguments(relabelConfigs []*prom_relabel.Config, forwardTo []stora
 	return &relabel.Arguments{
 		ForwardTo:            forwardTo,
 		MetricRelabelConfigs: ToFlowRelabelConfigs(relabelConfigs),
+		CacheSize:            100_000,
 	}
 }