diff --git a/modules/gui/macosx/library/VLCLibraryCollectionViewDelegate.m b/modules/gui/macosx/library/VLCLibraryCollectionViewDelegate.m
index 1fcc4b238c..19039981e7 100644
--- a/modules/gui/macosx/library/VLCLibraryCollectionViewDelegate.m
+++ b/modules/gui/macosx/library/VLCLibraryCollectionViewDelegate.m
@@ -73,9 +73,8 @@
         return _staticItemSize;
     }
     
-    VLCLibraryCollectionViewFlowLayout *collectionViewFlowLayout = (VLCLibraryCollectionViewFlowLayout*)collectionViewLayout;
+    VLCLibraryCollectionViewFlowLayout * const collectionViewFlowLayout = (VLCLibraryCollectionViewFlowLayout*)collectionViewLayout;
     if (collectionViewLayout) {
-        VLCLibraryCollectionViewFlowLayout *collectionViewFlowLayout = (VLCLibraryCollectionViewFlowLayout*)collectionViewLayout;
         return [VLCLibraryUIUnits adjustedCollectionViewItemSizeForCollectionView:collectionView
                                                                        withLayout:collectionViewFlowLayout
                                                              withItemsAspectRatio:_itemsAspectRatio];