diff --git a/src/manifold/src/csg_tree.cpp b/src/manifold/src/csg_tree.cpp
index ad58b5796..0b0d5da81 100644
--- a/src/manifold/src/csg_tree.cpp
+++ b/src/manifold/src/csg_tree.cpp
@@ -223,7 +223,7 @@ Manifold::Impl CsgLeafNode::Compose(
           const bool invert = glm::determinant(glm::mat3(node->transform_)) < 0;
           for_each_n(
               policy,
-              zip(combined.halfedgeTangent_.begin(), countAt(edgeIndices[i])),
+              zip(combined.halfedgeTangent_.begin() + edgeIndices[i], countAt(0)),
               node->pImpl_->halfedgeTangent_.size(),
               TransformTangents{glm::mat3(node->transform_), invert,
                                 node->pImpl_->halfedgeTangent_.cptrD(),
diff --git a/test/manifold_test.cpp b/test/manifold_test.cpp
index 37c600817..0f4ad2144 100644
--- a/test/manifold_test.cpp
+++ b/test/manifold_test.cpp
@@ -1088,3 +1088,12 @@ TEST(Manifold, Invalid) {
   EXPECT_EQ(Manifold::Extrude(empty_circ, 10.).Status(), invalid);
   EXPECT_EQ(Manifold::Revolve(empty_sq).Status(), invalid);
 }
+
+TEST(Manifold, MultiCompose) {
+  auto legAssembly = Manifold::Compose({Manifold::Cube({100, 140, 38})});
+  auto finalAssembly = Manifold::Compose(
+      {legAssembly, legAssembly.Translate({0, 300, 0}),
+       legAssembly.Mirror({1, 0, 0}).Translate({300, 0, 0}),
+       legAssembly.Mirror({1, 0, 0}).Translate({300, 300, 0})});
+  finalAssembly.GetMesh();
+}