diff --git a/gtsam/slam/PlanarSLAMGraph.h b/gtsam/slam/PlanarSLAMGraph.h
index e1db5a3e5..98eb9aaef 100644
--- a/gtsam/slam/PlanarSLAMGraph.h
+++ b/gtsam/slam/PlanarSLAMGraph.h
@@ -19,7 +19,6 @@
 
 #include <gtsam/slam/planarSLAM.h>
 #include <gtsam/slam/PlanarSLAMValues.h>
-#include <gtsam/nonlinear/NonlinearOptimization-inl.h>
 
 namespace gtsam {
 
diff --git a/gtsam/slam/planarSLAM.cpp b/gtsam/slam/planarSLAM.cpp
index 52030992e..5b1fc033a 100644
--- a/gtsam/slam/planarSLAM.cpp
+++ b/gtsam/slam/planarSLAM.cpp
@@ -18,7 +18,7 @@
 #include <gtsam/slam/planarSLAM.h>
 #include <gtsam/nonlinear/NonlinearFactorGraph-inl.h>
 #include <gtsam/nonlinear/NonlinearOptimizer-inl.h>
-//#include <gtsam/nonlinear/NonlinearOptimization-inl.h>
+#include <gtsam/nonlinear/NonlinearOptimization-inl.h>
 #include <gtsam/nonlinear/TupleValues-inl.h>
 
 // Use planarSLAM namespace for specific SLAM instance