diff --git a/behaviortree_ros2/include/behaviortree_ros2/bt_utils.hpp b/behaviortree_ros2/include/behaviortree_ros2/bt_utils.hpp
index e566758..db948b3 100644
--- a/behaviortree_ros2/include/behaviortree_ros2/bt_utils.hpp
+++ b/behaviortree_ros2/include/behaviortree_ros2/bt_utils.hpp
@@ -11,6 +11,8 @@
 // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+#pragma once
+
 #include <functional>
 #include <memory>
 #include <thread>
diff --git a/behaviortree_ros2/include/behaviortree_ros2/tree_execution_server.hpp b/behaviortree_ros2/include/behaviortree_ros2/tree_execution_server.hpp
index f472cfd..bde3fe8 100644
--- a/behaviortree_ros2/include/behaviortree_ros2/tree_execution_server.hpp
+++ b/behaviortree_ros2/include/behaviortree_ros2/tree_execution_server.hpp
@@ -11,6 +11,8 @@
 // COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+#pragma once
+
 #include <memory>
 #include <optional>