diff --git a/gtsam/navigation/NavState.cpp b/gtsam/navigation/NavState.cpp
index 6234b9c27..7c7aa373b 100644
--- a/gtsam/navigation/NavState.cpp
+++ b/gtsam/navigation/NavState.cpp
@@ -19,7 +19,6 @@
 #include <gtsam/navigation/NavState.h>
 
 #include <string>
-#include "gtsam/geometry/Rot3.h"
 
 namespace gtsam {