diff --git a/src/libslic3r/PrintObject.cpp b/src/libslic3r/PrintObject.cpp
index 83d25aefb..95e34bd05 100644
--- a/src/libslic3r/PrintObject.cpp
+++ b/src/libslic3r/PrintObject.cpp
@@ -429,7 +429,8 @@ void PrintObject::generate_support_spots()
         if (!this->shared_regions()->generated_support_points.has_value()) {
             PrintTryCancel                cancel_func = m_print->make_try_cancel();
             SupportSpotsGenerator::Params params{this->print()->m_config.filament_type.values,
-                                                 float(this->print()->m_config.perimeter_acceleration.getFloat())};
+                                                 float(this->print()->m_config.perimeter_acceleration.getFloat()),
+                                                 this->config().raft_layers.getInt()};
             auto [supp_points, partial_objects]              = SupportSpotsGenerator::full_search(this, cancel_func, params);
             this->m_shared_regions->generated_support_points = {this->trafo_centered(), supp_points};
             m_print->throw_if_canceled();
@@ -470,7 +471,9 @@ void PrintObject::estimate_curled_extrusions()
             // Estimate curling of support material and add it to the malformaition lines of each layer
             float                         support_flow_width = support_material_flow(this, this->config().layer_height).width();
             SupportSpotsGenerator::Params params{this->print()->m_config.filament_type.values,
-                                                 float(this->print()->config().perimeter_acceleration.getFloat())};
+                                                 float(this->print()->config().perimeter_acceleration.getFloat()),
+                                                 this->config().raft_layers.getInt()
+                                                 };
             SupportSpotsGenerator::estimate_supports_malformations(this->support_layers(), support_flow_width, params);
             SupportSpotsGenerator::estimate_malformations(this->layers(), params);
             m_print->throw_if_canceled();
diff --git a/src/libslic3r/SupportSpotsGenerator.hpp b/src/libslic3r/SupportSpotsGenerator.hpp
index 498795993..98dda20e2 100644
--- a/src/libslic3r/SupportSpotsGenerator.hpp
+++ b/src/libslic3r/SupportSpotsGenerator.hpp
@@ -14,7 +14,7 @@ namespace SupportSpotsGenerator {
 
 struct Params
 {
-    Params(const std::vector<std::string> &filament_types, float max_acceleration, size_t raft_layers_count)
+    Params(const std::vector<std::string> &filament_types, float max_acceleration, int raft_layers_count)
         : max_acceleration(max_acceleration), raft_layers_count(raft_layers_count)
     {
         if (filament_types.size() > 1) {
@@ -34,7 +34,7 @@ struct Params
     const float bridge_distance = 12.0f; // mm
     const float max_acceleration; // mm/s^2 ; max acceleration of object (bed) in XY (NOTE: The max hit is received by the object in the
                                   // jerk phase, so the usual machine limits are too low)
-    const size_t raft_layers_count;
+    const int raft_layers_count;
     std::string filament_type;
 
     const std::pair<float,float> malformation_distance_factors = std::pair<float, float> { 0.4, 1.2 };