diff --git a/nav2_behavior_tree/include/nav2_behavior_tree/bt_action_node.hpp b/nav2_behavior_tree/include/nav2_behavior_tree/bt_action_node.hpp
index cde12f8e5fb..9c9dc88be1c 100644
--- a/nav2_behavior_tree/include/nav2_behavior_tree/bt_action_node.hpp
+++ b/nav2_behavior_tree/include/nav2_behavior_tree/bt_action_node.hpp
@@ -97,7 +97,9 @@ class BtActionNode : public BT::ActionNodeBase
       RCLCPP_ERROR(
         node_->get_logger(), "\"%s\" action server not available after waiting for 1 s",
         action_name.c_str());
-      throw std::runtime_error(std::string("Action server %s not available", action_name.c_str()));
+      throw std::runtime_error(
+              std::string("Action server ") + action_name +
+              std::string(" not available"));
     }
   }
 
diff --git a/nav2_behavior_tree/include/nav2_behavior_tree/bt_cancel_action_node.hpp b/nav2_behavior_tree/include/nav2_behavior_tree/bt_cancel_action_node.hpp
index 504df9157a1..e87ffbfac48 100644
--- a/nav2_behavior_tree/include/nav2_behavior_tree/bt_cancel_action_node.hpp
+++ b/nav2_behavior_tree/include/nav2_behavior_tree/bt_cancel_action_node.hpp
@@ -93,7 +93,9 @@ class BtCancelActionNode : public BT::ActionNodeBase
       RCLCPP_ERROR(
         node_->get_logger(), "\"%s\" action server not available after waiting for 1 s",
         action_name.c_str());
-      throw std::runtime_error(std::string("Action server %s not available", action_name.c_str()));
+      throw std::runtime_error(
+              std::string("Action server ") + action_name +
+              std::string(" not available"));
     }
   }