diff --git a/src/object_detection/src/lidar_reader.cpp b/src/object_detection/src/lidar_reader.cpp
index d4ab0212..31647ba8 100644
--- a/src/object_detection/src/lidar_reader.cpp
+++ b/src/object_detection/src/lidar_reader.cpp
@@ -63,7 +63,7 @@ public:
     ITerarangerTowerEvo::ImuMode mode(ITerarangerTowerEvo::QuaternionLinearAcc);
 
     factory = terabee::ITerarangerFactory::getFactory();
-    tower = factory->createTerarangerTowerEvo(this->get_parameter("lidar_serial_port"));
+    tower = factory->createTerarangerTowerEvo(this->get_parameter("lidar_serial_port").as_string());
 
     if (!tower)
     {