diff --git a/gtsam/navigation/PreintegrationCombinedParams.h b/gtsam/navigation/PreintegrationCombinedParams.h
index 151f554f7..7d775d9e4 100644
--- a/gtsam/navigation/PreintegrationCombinedParams.h
+++ b/gtsam/navigation/PreintegrationCombinedParams.h
@@ -24,7 +24,6 @@
 
 /* GTSAM includes */
 #include <gtsam/base/Matrix.h>
-#include <gtsam/base/serialization.h>
 #include <gtsam/navigation/ManifoldPreintegration.h>
 #include <gtsam/navigation/PreintegrationCombinedParams.h>
 #include <gtsam/navigation/TangentPreintegration.h>