diff --git a/metropolis/test/launch/cluster.go b/metropolis/test/launch/cluster.go
index bb9f2f7..882f422 100644
--- a/metropolis/test/launch/cluster.go
+++ b/metropolis/test/launch/cluster.go
@@ -822,8 +822,12 @@
 	}
 
 	if opts.NodeLogsToFiles {
+		nodeLogDir := ld
+		if os.Getenv("TEST_UNDECLARED_OUTPUTS_DIR") != "" {
+			nodeLogDir = os.Getenv("TEST_UNDECLARED_OUTPUTS_DIR")
+		}
 		for i := range opts.NumNodes {
-			path := path.Join(ld, fmt.Sprintf("node-%d.txt", i))
+			path := path.Join(nodeLogDir, fmt.Sprintf("node-%d.txt", i))
 			port, err := NewSerialFileLogger(path)
 			if err != nil {
 				return nil, fmt.Errorf("could not open log file for node %d: %w", i, err)