diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index b50e5233cb..f2ae09de0f 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -1182,7 +1182,7 @@ sla::DrainHoles SLAPrintObject::transformed_drainhole_points() const
 {
     assert(m_model_object != nullptr);
     auto pts = m_model_object->sla_drain_holes;
-    const auto tr = trafo().cast<float>();
+    const Transform3f tr = trafo().cast<float>();
     const Vec3f sc = m_model_object->instances.front()->get_scaling_factor().cast<float>();
     for (sla::DrainHole &hl : pts) {
         hl.pos = tr * hl.pos;