diff --git a/cartographer/pose_graph/node.h b/cartographer/pose_graph/node.h
index 69b677a..f353229 100644
--- a/cartographer/pose_graph/node.h
+++ b/cartographer/pose_graph/node.h
@@ -19,6 +19,7 @@
 
 #include "cartographer/pose_graph/proto/node.pb.h"
 
+#include <array>
 #include <string>
 #include <vector>
 
diff --git a/cartographer/pose_graph/pose_2d.h b/cartographer/pose_graph/pose_2d.h
index 5d634b2..1b89d30 100644
--- a/cartographer/pose_graph/pose_2d.h
+++ b/cartographer/pose_graph/pose_2d.h
@@ -19,6 +19,7 @@
 
 #include "cartographer/pose_graph/node.h"
 
+#include <array>
 #include "Eigen/Core"
 
 namespace cartographer {