diff --git a/src/build123d/geometry.py b/src/build123d/geometry.py
index f4f8ee3f..56edfaa4 100644
--- a/src/build123d/geometry.py
+++ b/src/build123d/geometry.py
@@ -26,6 +26,7 @@
     limitations under the License.
 
 """
+
 from __future__ import annotations
 
 # pylint has trouble with the OCP imports
@@ -1953,6 +1954,10 @@ def __repr__(self):
         z_dir_str = ", ".join((f"{v:.2f}" for v in self.z_dir.to_tuple()))
         return f"Plane(o=({origin_str}), x=({x_dir_str}), z=({z_dir_str}))"
 
+    def reverse(self) -> Plane:
+        """Reverse z direction of plane"""
+        return -self
+
     @property
     def origin(self) -> Vector:
         """Get the Plane origin"""
diff --git a/tests/test_direct_api.py b/tests/test_direct_api.py
index 77999330..e5f9a27b 100644
--- a/tests/test_direct_api.py
+++ b/tests/test_direct_api.py
@@ -2248,6 +2248,13 @@ def test_plane_neg(self):
         self.assertVectorAlmostEquals(
             p2.y_dir, (-p.z_dir).cross(p.x_dir).normalized(), 6
         )
+        p3 = p.reverse()
+        self.assertVectorAlmostEquals(p3.origin, p.origin, 6)
+        self.assertVectorAlmostEquals(p3.x_dir, p.x_dir, 6)
+        self.assertVectorAlmostEquals(p3.z_dir, -p.z_dir, 6)
+        self.assertVectorAlmostEquals(
+            p3.y_dir, (-p.z_dir).cross(p.x_dir).normalized(), 6
+        )
 
     def test_plane_mul(self):
         p = Plane(origin=(1, 2, 3), x_dir=(1, 0, 0), z_dir=(0, 0, 1))