diff --git a/Basic_viewer/include/CGAL/Graphics_scene.h b/Basic_viewer/include/CGAL/Graphics_scene.h
index 73a5fafe637..155a471b217 100644
--- a/Basic_viewer/include/CGAL/Graphics_scene.h
+++ b/Basic_viewer/include/CGAL/Graphics_scene.h
@@ -374,7 +374,7 @@ public:
   void m_texts_clear()
   { m_texts.clear(); }
 
-  int m_texts_size() const
+  std::size_t m_texts_size() const
   { return m_texts.size(); }
 
   const std::vector<std::tuple<Local_point, std::string>>& get_m_texts() const