diff --git a/include/gtsam_points/ann/intensity_kdtree.hpp b/include/gtsam_points/ann/intensity_kdtree.hpp
index 31292ad4..0a6ee569 100644
--- a/include/gtsam_points/ann/intensity_kdtree.hpp
+++ b/include/gtsam_points/ann/intensity_kdtree.hpp
@@ -5,7 +5,6 @@
 
 #include <memory>
 #include <Eigen/Core>
-#include <nanoflann.hpp>
 #include <gtsam_points/ann/nearest_neighbor_search.hpp>
 
 // forward declaration