diff --git a/Libraries/LibGUI/GModel.cpp b/Libraries/LibGUI/GModel.cpp
index 46e1037c29..36e35abd56 100644
--- a/Libraries/LibGUI/GModel.cpp
+++ b/Libraries/LibGUI/GModel.cpp
@@ -46,9 +46,9 @@ void GModel::set_selected_index(const GModelIndex& index)
     });
 }
 
-GModelIndex GModel::create_index(int row, int column, void* data) const
+GModelIndex GModel::create_index(int row, int column, const void* data) const
 {
-    return GModelIndex(*this, row, column, data);
+    return GModelIndex(*this, row, column, const_cast<void*>(data));
 }
 
 GModelIndex GModel::sibling(int row, int column, const GModelIndex& parent) const
diff --git a/Libraries/LibGUI/GModel.h b/Libraries/LibGUI/GModel.h
index 0aee640eac..bfdc9125c8 100644
--- a/Libraries/LibGUI/GModel.h
+++ b/Libraries/LibGUI/GModel.h
@@ -97,7 +97,7 @@ protected:
     void for_each_view(Function<void(GAbstractView&)>);
     void did_update();
 
-    GModelIndex create_index(int row, int column, void* data = nullptr) const;
+    GModelIndex create_index(int row, int column, const void* data = nullptr) const;
 
 private:
     HashTable<GAbstractView*> m_views;