diff --git a/gtsam/base/Lie.h b/gtsam/base/Lie.h
index bc530a9f5..a770d9975 100644
--- a/gtsam/base/Lie.h
+++ b/gtsam/base/Lie.h
@@ -133,7 +133,7 @@ template <class T> Matrix wedge(const Vector& x);
 template <class T>
 T expm(const Vector& x, int K=7) {
 	Matrix xhat = wedge<T>(x);
-	return expm(xhat,K);
+	return T(expm(xhat,K));
 }
 
 } // namespace gtsam