diff --git a/sciurus17_examples/src/point_cloud_detection.cpp b/sciurus17_examples/src/point_cloud_detection.cpp
index 5217704..5a82277 100644
--- a/sciurus17_examples/src/point_cloud_detection.cpp
+++ b/sciurus17_examples/src/point_cloud_detection.cpp
@@ -172,7 +172,7 @@ class PointCloudSubscriber : public rclcpp::Node
     seg.segment(*inliers, *coefficients);
 
     // 平面が検出できなかった場合
-    if (inliers->indices.size() <= 0) {
+    if (inliers->indices.empty()) {
       RCLCPP_INFO(this->get_logger(), "Could not estimate a planar model for the given dataset.");
       return false;
     }