diff --git a/src/libvgcode/src/Layers.cpp b/src/libvgcode/src/Layers.cpp
index 5e52bc7aa9..1ef6c3236a 100644
--- a/src/libvgcode/src/Layers.cpp
+++ b/src/libvgcode/src/Layers.cpp
@@ -75,7 +75,7 @@ std::vector<float> Layers::get_zs() const
 
 size_t Layers::get_layer_id_at(float z) const
 {
-    auto iter = std::upper_bound(m_items.begin(), m_items.end(), z, [](float z, const Item& item) { return item.z < z; });
+    auto iter = std::upper_bound(m_items.begin(), m_items.end(), z, [](float z, const Item& item) { return item.z > z; });
     return std::distance(m_items.begin(), iter);
 }