diff --git a/gtsam/geometry/Line3.cpp b/gtsam/geometry/Line3.cpp
index c339c96ca..a61cfc251 100644
--- a/gtsam/geometry/Line3.cpp
+++ b/gtsam/geometry/Line3.cpp
@@ -1,5 +1,4 @@
 #include <gtsam/geometry/Line3.h>
-#include <cstdlib>
 
 namespace gtsam {