diff --git a/arangod/Graph/BreadthFirstEnumerator.h b/arangod/Graph/BreadthFirstEnumerator.h
index 951fa3c067..73b04939b6 100644
--- a/arangod/Graph/BreadthFirstEnumerator.h
+++ b/arangod/Graph/BreadthFirstEnumerator.h
@@ -45,7 +45,7 @@ class BreadthFirstEnumerator final : public arangodb::traverser::PathEnumerator
   struct PathStep {
     size_t sourceIdx;
     graph::EdgeDocumentToken edge;
-    arangodb::velocypack::StringRef const vertex;
+    arangodb::velocypack::StringRef /* const */ vertex;
 
    public:
     explicit PathStep(arangodb::velocypack::StringRef const vertex);