diff --git a/src/libslic3r/SLAPrint.cpp b/src/libslic3r/SLAPrint.cpp
index 1e00e6edb..4d34c09c7 100644
--- a/src/libslic3r/SLAPrint.cpp
+++ b/src/libslic3r/SLAPrint.cpp
@@ -1184,7 +1184,7 @@ sla::DrainHoles SLAPrintObject::transformed_drainhole_points() const
     auto tr = trafo().cast<float>();
     for (sla::DrainHole &hl : pts) {
         hl.pos = tr * hl.pos;
-        hl.normal = tr * hl.normal;
+        hl.normal = tr * hl.normal - tr.translation();
     }
     
     return pts;