diff --git a/gtsam/nonlinear/utilities.h b/gtsam/nonlinear/utilities.h
index 891c6fd80..07a43af53 100644
--- a/gtsam/nonlinear/utilities.h
+++ b/gtsam/nonlinear/utilities.h
@@ -19,6 +19,7 @@
 
 #include <gtsam/inference/Symbol.h>
 #include <gtsam/slam/ProjectionFactor.h>
+#include <gtsam/linear/Sampler.h>
 #include <gtsam/nonlinear/NonlinearFactorGraph.h>
 #include <gtsam/nonlinear/NonlinearFactor.h>
 #include <gtsam/nonlinear/Values.h>