diff --git a/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m b/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m
index b1e00770c1..d548d937ad 100644
--- a/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m
+++ b/AsyncDisplayKit/Details/ASCollectionViewFlowLayoutInspector.m
@@ -65,7 +65,7 @@ static inline ASSizeRange NodeConstrainedSizeForScrollDirection(ASCollectionView
     return [collectionView.asyncDelegate collectionView:collectionView constrainedSizeForNodeAtIndexPath:indexPath];
   } else {
     // With 2.0 `collectionView:constrainedSizeForNodeAtIndexPath:` was moved to the delegate. Assert if not implemented on the delegate but on the data source
-    ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDataSource.");
+    ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDelegate.");
   }
   
   return NodeConstrainedSizeForScrollDirection(collectionView);
@@ -148,7 +148,7 @@ static inline ASSizeRange NodeConstrainedSizeForScrollDirection(ASCollectionView
     return [collectionView.asyncDelegate collectionView:collectionView constrainedSizeForNodeAtIndexPath:indexPath];
   } else {
     // With 2.0 `collectionView:constrainedSizeForNodeAtIndexPath:` was moved to the delegate. Assert if not implemented on the delegate but on the data source
-    ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDataSource.");
+    ASDisplayNodeAssert([collectionView.asyncDataSource respondsToSelector:@selector(collectionView:constrainedSizeForNodeAtIndexPath:)] == NO, @"collectionView:constrainedSizeForNodeAtIndexPath: was moved from the ASCollectionDataSource to the ASCollectionDelegate.");
   }
   
   CGSize itemSize = _layout.itemSize;