diff --git a/src/libslic3r/Support/TreeSupport3D.cpp b/src/libslic3r/Support/TreeSupport3D.cpp
index 8b364b85f0..e1971e9b4c 100644
--- a/src/libslic3r/Support/TreeSupport3D.cpp
+++ b/src/libslic3r/Support/TreeSupport3D.cpp
@@ -1711,7 +1711,7 @@ static Point move_inside_if_outside(const Polygons &polygons, Point from, int di
                         volumes.getCollision(radius, layer_idx - 1, settings.use_min_distance)
                 ));
             check_layer_data = current_elem.to_buildplate ? to_bp_data : to_model_data;
-            if (area(check_layer_data) < tiny_area_threshold) {
+            if (area(check_layer_data) < _tiny_area_threshold) {
                 BOOST_LOG_TRIVIAL(debug) << "Lost area by doing catch up from " << ceil_radius_before << " to radius " <<
                     volumes.ceilRadius(support_element_collision_radius(config, current_elem), settings.use_min_distance);
                 tree_supports_show_error("Area lost catching up radius. May not cause visible malformation."sv, true);
@@ -2495,7 +2495,7 @@ static void create_layer_pathing(const TreeModelVolumes &volumes, const TreeSupp
                         // This area was removed completely due to collisions.
                         return true;
                     if (elem.areas.to_bp_areas.empty() && elem.areas.to_model_areas.empty()) {
-                        if (area(elem.areas.influence_areas) < tiny_area_threshold) {
+                        if (area(elem.areas.influence_areas) < _tiny_area_threshold) {
                             BOOST_LOG_TRIVIAL(warning) << "Insert Error of Influence area bypass on layer " << layer_idx - 1;
                             tree_supports_show_error("Insert error of area after bypassing merge.\n"sv, true);
                         }
@@ -2528,7 +2528,7 @@ static void create_layer_pathing(const TreeModelVolumes &volumes, const TreeSupp
             for (SupportElementMerging &elem : influence_areas)
                 if (! elem.areas.influence_areas.empty()) {
                     Polygons new_area = safe_union(elem.areas.influence_areas);
-                    if (area(new_area) < tiny_area_threshold) {
+                    if (area(new_area) < _tiny_area_threshold) {
                         BOOST_LOG_TRIVIAL(warning) << "Insert Error of Influence area on layer " << layer_idx - 1 << ". Origin of " << elem.parents.size() << " areas. Was to bp " << elem.state.to_buildplate;
                         tree_supports_show_error("Insert error of area after merge.\n"sv, true);
                     }