diff --git a/include/clad/Differentiator/DynamicGraph.h b/include/clad/Differentiator/DynamicGraph.h
index db1113116..f7b5f61b0 100644
--- a/include/clad/Differentiator/DynamicGraph.h
+++ b/include/clad/Differentiator/DynamicGraph.h
@@ -106,7 +106,7 @@ template <typename T> class DynamicGraph {
   bool isProcessingNode() { return m_currentId != -1; }
 
   /// Get the nodes in the graph.
-  std::vector<T> getNodes() { return m_nodes; }
+  const std::vector<T>& getNodes() { return m_nodes; }
 
   /// Print the nodes and edges in the graph.
   void print() {
@@ -140,4 +140,4 @@ template <typename T> class DynamicGraph {
 };
 } // end namespace clad
 
-#endif // CLAD_DIFFERENTIATOR_DYNAMICGRAPH_H
\ No newline at end of file
+#endif // CLAD_DIFFERENTIATOR_DYNAMICGRAPH_H