diff --git a/include/vsg/vk/State.h b/include/vsg/vk/State.h
index 59234bac9d..9ae66a6a34 100644
--- a/include/vsg/vk/State.h
+++ b/include/vsg/vk/State.h
@@ -223,6 +223,18 @@ namespace vsg
             value_type f = -proj[1][1];
             value_type sc = f * std::sqrt(square(mv[0][0]) + square(mv[1][0]) + square(mv[2][0]) + square(mv[0][1]) + square(mv[1][1]) + square(mv[2][1])) * 0.5;
             value_type inv_scale = value_type(1.0) / sc;
+
+            // For an orthographic projection the projected size of a bounding sphere is independent of
+            // its distance from the eye (proj[2][3] == 0: there is no perspective divide). Using the
+            // eye-space depth as done below for perspective would make LOD selection and small-feature
+            // culling vary with distance, which is wrong for ortho, so use a constant lod distance
+            // derived purely from the projection scale.
+            if (proj[2][3] == value_type(0.0))
+            {
+                lodScale.set(value_type(0.0), value_type(0.0), value_type(0.0), inv_scale);
+                return;
+            }
+
             lodScale.set(mv[0][2] * inv_scale,
                          mv[1][2] * inv_scale,
                          mv[2][2] * inv_scale,