diff --git a/gtsam/base/LieMatrix.h b/gtsam/base/LieMatrix.h
index 23e5fd023..ca6cf1b3f 100644
--- a/gtsam/base/LieMatrix.h
+++ b/gtsam/base/LieMatrix.h
@@ -174,4 +174,12 @@ private:
   }
 
 };
+template<>
+struct is_manifold<LieMatrix> : public std::true_type {
+};
+
+template<>
+struct dimension<LieMatrix> : public Dynamic {
+};
+
 } // \namespace gtsam