diff --git a/Libraries/LibGUI/SortingProxyModel.cpp b/Libraries/LibGUI/SortingProxyModel.cpp
index 0510478a6e2..4a5be37c726 100644
--- a/Libraries/LibGUI/SortingProxyModel.cpp
+++ b/Libraries/LibGUI/SortingProxyModel.cpp
@@ -109,6 +109,15 @@ void SortingProxyModel::set_key_column_and_sort_order(int column, SortOrder sort
     resort();
 }
 
+bool SortingProxyModel::less_than(const ModelIndex& index1, const ModelIndex& index2) const
+{
+    auto data1 = data(index1, Role::Sort);
+    auto data2 = data(index2, Role::Sort);
+    if (data1.is_string() && data2.is_string())
+        return data1.as_string().to_lowercase() < data2.as_string().to_lowercase();
+    return data1 < data2;
+}
+
 void SortingProxyModel::resort(unsigned flags)
 {
     auto old_row_mappings = m_row_mappings;
@@ -121,15 +130,7 @@ void SortingProxyModel::resort(unsigned flags)
         return;
     }
     quick_sort(m_row_mappings, [&](auto row1, auto row2) -> bool {
-        auto data1 = source().data(source().index(row1, m_key_column), m_sort_role);
-        auto data2 = source().data(source().index(row2, m_key_column), m_sort_role);
-        if (data1 == data2)
-            return 0;
-        bool is_less_than;
-        if (data1.is_string() && data2.is_string() && !m_sorting_case_sensitive)
-            is_less_than = data1.as_string().to_lowercase() < data2.as_string().to_lowercase();
-        else
-            is_less_than = data1 < data2;
+        bool is_less_than = less_than(source().index(row1, m_key_column), source().index(row2, m_key_column));
         return m_sort_order == SortOrder::Ascending ? is_less_than : !is_less_than;
     });
     for_each_view([&](AbstractView& view) {
diff --git a/Libraries/LibGUI/SortingProxyModel.h b/Libraries/LibGUI/SortingProxyModel.h
index e3b83025b20..9e2323a03c3 100644
--- a/Libraries/LibGUI/SortingProxyModel.h
+++ b/Libraries/LibGUI/SortingProxyModel.h
@@ -30,7 +30,7 @@
 
 namespace GUI {
 
-class SortingProxyModel final
+class SortingProxyModel
     : public Model
     , private ModelClient {
 public:
@@ -49,6 +49,8 @@ public:
     virtual void set_key_column_and_sort_order(int, SortOrder) override;
     virtual bool is_column_sortable(int column_index) const override;
 
+    virtual bool less_than(const ModelIndex&, const ModelIndex&) const;
+
     ModelIndex map_to_source(const ModelIndex&) const;
 
     Role sort_role() const { return m_sort_role; }
@@ -65,15 +67,11 @@ private:
 
     void resort(unsigned flags = Model::UpdateFlag::DontInvalidateIndexes);
 
-    void set_sorting_case_sensitive(bool b) { m_sorting_case_sensitive = b; }
-    bool is_sorting_case_sensitive() { return m_sorting_case_sensitive; }
-
     NonnullRefPtr<Model> m_source;
     Vector<int> m_row_mappings;
     int m_key_column { -1 };
     SortOrder m_sort_order { SortOrder::Ascending };
     Role m_sort_role { Role::Sort };
-    bool m_sorting_case_sensitive { false };
 };
 
 }