diff --git a/src/layouts/QskGridBox.cpp b/src/layouts/QskGridBox.cpp
index fcd1169e..583650ab 100644
--- a/src/layouts/QskGridBox.cpp
+++ b/src/layouts/QskGridBox.cpp
@@ -384,7 +384,18 @@ QSizeF QskGridBox::layoutSizeHint(
         return QSizeF();
     }
 
-    return m_data->engine.sizeHint( which, constraint );
+    auto hint = m_data->engine.sizeHint( which, constraint );
+
+    if ( constraint.width() >= 0.0 )
+    {
+        hint.setWidth( -1.0 );
+    }
+    else if ( constraint.height() >= 0.0 )
+    {
+        hint.setHeight( -1.0 );
+    }
+
+    return hint;
 }
 
 void QskGridBox::geometryChangeEvent( QskGeometryChangeEvent* event )
diff --git a/src/layouts/QskLinearBox.cpp b/src/layouts/QskLinearBox.cpp
index 9b1aa07b..ca01e6cc 100644
--- a/src/layouts/QskLinearBox.cpp
+++ b/src/layouts/QskLinearBox.cpp
@@ -212,7 +212,18 @@ QSizeF QskLinearBox::layoutSizeHint(
         return QSizeF();
     }
 
-    return m_data->engine.sizeHint( which, constraint );
+    auto hint = m_data->engine.sizeHint( which, constraint );
+
+    if ( constraint.width() >= 0.0 )
+    {
+        hint.setWidth( -1.0 );
+    }
+    else if ( constraint.height() >= 0.0 )
+    {
+        hint.setHeight( -1.0 );
+    }
+
+    return hint;
 }
 
 void QskLinearBox::geometryChangeEvent( QskGeometryChangeEvent* event )