diff --git a/geometry/line_segment_intersection.cpp b/geometry/line_segment_intersection.cpp
index f386c5623..d523ae0a4 100644
--- a/geometry/line_segment_intersection.cpp
+++ b/geometry/line_segment_intersection.cpp
@@ -3,6 +3,7 @@
  * @brief check whether two line segments intersect each other
  * or not.
  */
+#include <algorithm>
 #include <iostream>
 
 /**