1 files changed, 1 insertions, 1 deletions
diff --git a/src/parse.h b/src/parse.h
index 3f86eec..ec86302 100644
--- a/src/parse.h
+++ b/src/parse.h
@@ -15,7 +15,7 @@ public:
         }
     }
 
-    Graph get_graph() {
+    const Graph & get_graph() {
         return graph_;
     }
 private: