diff --git a/ui/build/build.go b/ui/build/build.go
index aadf4af..ec42b70 100644
--- a/ui/build/build.go
+++ b/ui/build/build.go
@@ -266,6 +266,7 @@
 	}
 
 	if config.StartRBE() {
+		cleanupRBELogsDir(ctx, config)
 		startRBE(ctx, config)
 		defer DumpRBEMetrics(ctx, config, filepath.Join(config.LogsDir(), "rbe_metrics.pb"))
 	}