diff --git a/examples/Pose2SLAMExample_graph.cpp b/examples/Pose2SLAMExample_graph.cpp
index 0c64634c5..c3d901507 100644
--- a/examples/Pose2SLAMExample_graph.cpp
+++ b/examples/Pose2SLAMExample_graph.cpp
@@ -19,6 +19,7 @@
 // For an explanation of headers below, please see Pose2SLAMExample.cpp
 #include <gtsam/slam/PriorFactor.h>
 #include <gtsam/slam/BetweenFactor.h>
+#include <gtsam/geometry/Pose2.h>
 #include <gtsam/nonlinear/LevenbergMarquardtOptimizer.h>
 #include <gtsam/nonlinear/Marginals.h>