diff --git a/src/corelib/text/qlocale.cpp b/src/corelib/text/qlocale.cpp
index 65b8e038906..01e8a7face4 100644
--- a/src/corelib/text/qlocale.cpp
+++ b/src/corelib/text/qlocale.cpp
@@ -807,8 +807,8 @@ static uint defaultIndex()
     }
 #endif
 
-    Q_ASSERT(data >= locale_data);
-    Q_ASSERT(data < locale_data + std::size(locale_data));
+    using QtPrivate::q_points_into_range;
+    Q_ASSERT(q_points_into_range(data, locale_data, std::end(locale_data)));
     return data - locale_data;
 }