diff --git a/src/libslic3r/Format/3mf.cpp b/src/libslic3r/Format/3mf.cpp
index 64a7165081..e10b26f383 100644
--- a/src/libslic3r/Format/3mf.cpp
+++ b/src/libslic3r/Format/3mf.cpp
@@ -710,7 +710,7 @@ namespace Slic3r {
 #endif // ENABLE_RELOAD_FROM_DISK_FOR_3MF
 
         for (const IdToModelObjectMap::value_type& object : m_objects) {
-            if (object.second >= m_model->objects.size()) {
+            if (object.second >= int(m_model->objects.size())) {
                 add_error("Unable to find object");
                 return false;
             }
@@ -1395,7 +1395,7 @@ namespace Slic3r {
     {
         // deletes all non-built or non-instanced objects
         for (const IdToModelObjectMap::value_type& object : m_objects) {
-            if (object.second >= m_model->objects.size()) {
+            if (object.second >= int(m_model->objects.size())) {
                 add_error("Unable to find object");
                 return false;
             }
diff --git a/src/libslic3r/SupportMaterial.cpp b/src/libslic3r/SupportMaterial.cpp
index b65c9ec994..7ba0b5e8fb 100644
--- a/src/libslic3r/SupportMaterial.cpp
+++ b/src/libslic3r/SupportMaterial.cpp
@@ -2311,7 +2311,7 @@ std::pair<PrintObjectSupportMaterial::MyLayersPtr, PrintObjectSupportMaterial::M
             return &layer_new;
         };
         tbb::parallel_for(tbb::blocked_range<int>(0, int(intermediate_layers.size())),
-            [this, &bottom_contacts, &top_contacts, &intermediate_layers, &insert_layer, num_interface_layers, num_base_interface_layers, num_interface_layers_only,
+            [&bottom_contacts, &top_contacts, &intermediate_layers, &insert_layer, num_interface_layers, num_base_interface_layers, num_interface_layers_only,
              &interface_layers, &base_interface_layers](const tbb::blocked_range<int>& range) {                
                 // Gather the top / bottom contact layers intersecting with num_interface_layers resp. num_interface_layers_only intermediate layers above / below
                 // this intermediate layer.