diff --git a/src/corelib/tools/qlist.h b/src/corelib/tools/qlist.h
index c00220ad3a..49ccbc9c9f 100644
--- a/src/corelib/tools/qlist.h
+++ b/src/corelib/tools/qlist.h
@@ -413,7 +413,8 @@ private:
 
     bool isValidIterator(const iterator &i) const Q_DECL_NOTHROW
     {
-        return (constBegin().i <= i.i) && (i.i <= constEnd().i);
+        const std::less<const Node *> less = {};
+        return !less(i.i, cbegin().i) && !less(cend().i, i.i);
     }
 
 private:
diff --git a/src/corelib/tools/qvarlengtharray.h b/src/corelib/tools/qvarlengtharray.h
index b74b1fd123..597e7464cb 100644
--- a/src/corelib/tools/qvarlengtharray.h
+++ b/src/corelib/tools/qvarlengtharray.h
@@ -254,7 +254,8 @@ private:
 
     bool isValidIterator(const const_iterator &i) const
     {
-        return (i <= constEnd()) && (constBegin() <= i);
+        const std::less<const T*> less = {};
+        return !less(cend(), i) && !less(i, cbegin());
     }
 };
 
diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h
index 345ba4b097..30fd7b2865 100644
--- a/src/corelib/tools/qvector.h
+++ b/src/corelib/tools/qvector.h
@@ -306,7 +306,8 @@ private:
     void destruct(T *from, T *to);
     bool isValidIterator(const iterator &i) const
     {
-        return (i <= d->end()) && (d->begin() <= i);
+        const std::less<const T*> less = {};
+        return !less(d->end(), i) && !less(i, d->begin());
     }
     class AlignmentDummy { Data header; T array[1]; };
 };