diff --git a/panda_gazebo/src/panda_joint_locker_world_plugin.cpp b/panda_gazebo/src/panda_joint_locker_world_plugin.cpp
index 1669dbde..321bbe07 100644
--- a/panda_gazebo/src/panda_joint_locker_world_plugin.cpp
+++ b/panda_gazebo/src/panda_joint_locker_world_plugin.cpp
@@ -113,7 +113,7 @@ class PandaJointLockerPlugin : public WorldPlugin
     }
 
     res.success = true;
-    res.message = "Joint " + (req.lock ? "locking" : "unlocking") + " successful";
+    res.message = std::string("Joint ") + (req.lock ? "locking" : "unlocking") + " successful";
     return true;
   }
 };