diff --git a/gtsam/geometry/Cal3_S2Stereo.h b/gtsam/geometry/Cal3_S2Stereo.h
index 8a314e71b..18977d409 100644
--- a/gtsam/geometry/Cal3_S2Stereo.h
+++ b/gtsam/geometry/Cal3_S2Stereo.h
@@ -20,7 +20,6 @@
 #include <gtsam/base/Matrix.h>
 #include <gtsam/geometry/Point2.h>
 #include <gtsam/geometry/Cal3_S2.h>
-#include <math.h>
 
 namespace gtsam {