diff --git a/xs/src/admesh/stl.h b/xs/src/admesh/stl.h
index 89fd73a55..033e3f5eb 100644
--- a/xs/src/admesh/stl.h
+++ b/xs/src/admesh/stl.h
@@ -201,6 +201,7 @@ extern void stl_rotate_z(stl_file *stl, float angle);
 extern void stl_mirror_xy(stl_file *stl);
 extern void stl_mirror_yz(stl_file *stl);
 extern void stl_mirror_xz(stl_file *stl);
+extern void stl_transform(stl_file *stl, float const *trafo3x4);
 extern void stl_transform(stl_file const *stl_src, stl_file *stl_dst, float const *trafo3x4);
 extern void stl_open_merge(stl_file *stl, ADMESH_CHAR *file);
 extern void stl_invalidate_shared_vertices(stl_file *stl);
diff --git a/xs/src/admesh/util.c b/xs/src/admesh/util.c
index 44e23cc03..3330ca5b6 100644
--- a/xs/src/admesh/util.c
+++ b/xs/src/admesh/util.c
@@ -185,6 +185,24 @@ void calculate_normals(stl_file *stl) {
   }
 }
 
+void stl_transform(stl_file *stl, float const *trafo3x4) {
+  int i_face, i_vertex, i, j;
+  if (stl->error)
+    return;
+  for (i_face = 0; i_face < stl->stats.number_of_facets; ++ i_face) {
+    stl_vertex *vertices = stl->facet_start[i_face].vertex;
+    for (i_vertex = 0; i_vertex < 3; ++ i_vertex) {
+      stl_vertex* v_dst = &vertices[i_vertex];
+      stl_vertex  v_src = *v_dst;
+      v_dst->x = trafo3x4[0] * v_src.x + trafo3x4[1] * v_src.y + trafo3x4[2]  * v_src.z + trafo3x4[3];
+      v_dst->y = trafo3x4[4] * v_src.x + trafo3x4[5] * v_src.y + trafo3x4[6]  * v_src.z + trafo3x4[7];
+      v_dst->z = trafo3x4[8] * v_src.x + trafo3x4[9] * v_src.y + trafo3x4[10] * v_src.z + trafo3x4[11];
+    }
+  }
+  stl_get_size(stl);
+  calculate_normals(stl);
+}
+
 void stl_transform(stl_file const *stl_src, stl_file *stl_dst, float const *trafo3x4) {
   int i_face, i_vertex, i, j;
   if (stl_src->error || stl_dst->error)