diff --git a/gtsam_unstable/nonlinear/BatchFixedLagSmoother.h b/gtsam_unstable/nonlinear/BatchFixedLagSmoother.h
new file mode 100644
index 000000000..52ffe7a70
--- /dev/null
+++ b/gtsam_unstable/nonlinear/BatchFixedLagSmoother.h
@@ -0,0 +1,21 @@
+/* ----------------------------------------------------------------------------
+
+ * GTSAM Copyright 2010, Georgia Tech Research Corporation,
+ * Atlanta, Georgia 30332-0415
+ * All Rights Reserved
+ * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
+
+ * See LICENSE for the license information
+
+ * -------------------------------------------------------------------------- */
+
+#pragma once
+
+#ifdef _MSC_VER
+#pragma message("BatchFixedLagSmoother was moved to the gtsam/nonlinear directory")
+#else
+#warning "BatchFixedLagSmoother was moved to the gtsam/nonlinear directory"
+#endif
+
+
+#include <gtsam/nonlinear/BatchFixedLagSmoother.h>
diff --git a/gtsam_unstable/nonlinear/FixedLagSmoother.h b/gtsam_unstable/nonlinear/FixedLagSmoother.h
new file mode 100644
index 000000000..ae4fa874f
--- /dev/null
+++ b/gtsam_unstable/nonlinear/FixedLagSmoother.h
@@ -0,0 +1,21 @@
+/* ----------------------------------------------------------------------------
+
+ * GTSAM Copyright 2010, Georgia Tech Research Corporation,
+ * Atlanta, Georgia 30332-0415
+ * All Rights Reserved
+ * Authors: Frank Dellaert, et al. (see THANKS for the full author list)
+
+ * See LICENSE for the license information
+
+ * -------------------------------------------------------------------------- */
+
+#pragma once
+
+#ifdef _MSC_VER
+#pragma message("FixedLagSmoother was moved to the gtsam/nonlinear directory")
+#else
+#warning "FixedLagSmoother was moved to the gtsam/nonlinear directory"
+#endif
+
+
+#include <gtsam/nonlinear/FixedLagSmoother.h>
diff --git a/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h b/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
index beef95c1b..bc1c48524 100644
--- a/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
+++ b/gtsam_unstable/nonlinear/IncrementalFixedLagSmoother.h
@@ -20,7 +20,7 @@
 // \callgraph
 #pragma once
 
-#include <gtsam_unstable/nonlinear/FixedLagSmoother.h>
+#include <gtsam/nonlinear/FixedLagSmoother.h>
 #include <gtsam/nonlinear/ISAM2.h>
 
 namespace gtsam {