diff --git a/masque/builder/tools.py b/masque/builder/tools.py
index f8779bd..c14b5d3 100644
--- a/masque/builder/tools.py
+++ b/masque/builder/tools.py
@@ -85,8 +85,8 @@ class RenderStep:
         new_start = self.start_port.copy()
         new_end = self.end_port.copy()
 
-        new_start.mirror(axis)
-        new_end.mirror(axis)
+        new_start.flip_across(axis=axis)
+        new_end.flip_across(axis=axis)
 
         return RenderStep(
             opcode = self.opcode,
diff --git a/masque/test/test_renderpather.py b/masque/test/test_renderpather.py
index 3ad0d95..73b5f46 100644
--- a/masque/test/test_renderpather.py
+++ b/masque/test/test_renderpather.py
@@ -65,6 +65,17 @@ def test_renderpather_bend(rpather_setup: tuple[RenderPather, PathTool, Library]
     assert_allclose(path_shape.vertices, [[0, 0], [0, -10], [0, -20], [-1, -20]], atol=1e-10)
 
 
+def test_renderpather_mirror_preserves_planned_bend_geometry(rpather_setup: tuple[RenderPather, PathTool, Library]) -> None:
+    rp, tool, lib = rpather_setup
+    rp.at("start").straight(10).cw(10)
+
+    rp.mirror(0)
+    rp.render()
+
+    path_shape = cast("Path", rp.pattern.shapes[(1, 0)][0])
+    assert_allclose(path_shape.vertices, [[0, 0], [0, 10], [0, 20], [-1, 20]], atol=1e-10)
+
+
 def test_renderpather_retool(rpather_setup: tuple[RenderPather, PathTool, Library]) -> None:
     rp, tool1, lib = rpather_setup
     tool2 = PathTool(layer=(2, 0), width=4, ptype="wire")