diff --git a/gtsam_unstable/nonlinear/AdaptAutoDiff.h b/gtsam/nonlinear/AdaptAutoDiff.h
similarity index 100%
rename from gtsam_unstable/nonlinear/AdaptAutoDiff.h
rename to gtsam/nonlinear/AdaptAutoDiff.h
diff --git a/gtsam_unstable/nonlinear/tests/testAdaptAutoDiff.cpp b/gtsam/nonlinear/tests/testAdaptAutoDiff.cpp
similarity index 99%
rename from gtsam_unstable/nonlinear/tests/testAdaptAutoDiff.cpp
rename to gtsam/nonlinear/tests/testAdaptAutoDiff.cpp
index e618d0a1a..7d31616c5 100644
--- a/gtsam_unstable/nonlinear/tests/testAdaptAutoDiff.cpp
+++ b/gtsam/nonlinear/tests/testAdaptAutoDiff.cpp
@@ -18,7 +18,7 @@
  */
 
 #include <gtsam/3rdparty/ceres/example.h>
-#include <gtsam_unstable/nonlinear/AdaptAutoDiff.h>
+#include <gtsam/nonlinear/AdaptAutoDiff.h>
 #include <gtsam/nonlinear/Expression.h>
 #include <gtsam/geometry/PinholeCamera.h>
 #include <gtsam/geometry/Pose3.h>