diff --git a/NHAlignmentFlowLayout/NHAlignmentFlowLayout.m b/NHAlignmentFlowLayout/NHAlignmentFlowLayout.m
index 62ca981..515d1de 100644
--- a/NHAlignmentFlowLayout/NHAlignmentFlowLayout.m
+++ b/NHAlignmentFlowLayout/NHAlignmentFlowLayout.m
@@ -144,7 +144,7 @@ -(UICollectionViewLayoutAttributes *)layoutAttributesForBottomAlignmentForItemAt
 		return attributes;
 	}
 	
-	if (indexPath.item == [self.collectionView numberOfItemsInSection:indexPath.section]) {
+	if (indexPath.item == [self.collectionView numberOfItemsInSection:indexPath.section] - 1) {
 		frame.origin.y = self.collectionViewContentSize.height - self.sectionInset.bottom - frame.size.height;
 	} else {
 		NSIndexPath *nextIndexPath = [NSIndexPath indexPathForItem:indexPath.item + 1 inSection:indexPath.section];