diff --git a/src/antenna/examples/adjacency-matrix-example.cc b/src/antenna/examples/adjacency-matrix-example.cc
index 971a0f6d5..969d64607 100644
--- a/src/antenna/examples/adjacency-matrix-example.cc
+++ b/src/antenna/examples/adjacency-matrix-example.cc
@@ -98,7 +98,7 @@ main(int argc, char** argv)
                 }
                 else
                 {
-                    routeMap[{i, j}] = {(int)i};
+                    routeMap[{i, j}] = std::vector<int>{(int)i};
                 }
             }
         }