diff --git a/metropolis/pkg/logtree/unraw/unraw.go b/metropolis/pkg/logtree/unraw/unraw.go
index 807d79b..8e319d2 100644
--- a/metropolis/pkg/logtree/unraw/unraw.go
+++ b/metropolis/pkg/logtree/unraw/unraw.go
@@ -113,6 +113,7 @@
 		if err != nil {
 			return fmt.Errorf("when opening named pipe: %w", err)
 		}
+		defer fifo.Close()
 		supervisor.Signal(ctx, supervisor.SignalHealthy)
 		for {
 			// Quit if requested.