diff --git a/.gitignore b/.gitignore
index a3cd143..4535251 100644
--- a/.gitignore
+++ b/.gitignore
@@ -24,3 +24,4 @@ DerivedData
 # http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
 #
 # Pods/
+.DS_Store
diff --git a/JSDropDownMenu/JSDropDownMenu.m b/JSDropDownMenu/JSDropDownMenu.m
index 61c0fbf..a7404e5 100644
--- a/JSDropDownMenu/JSDropDownMenu.m
+++ b/JSDropDownMenu/JSDropDownMenu.m
@@ -676,7 +676,9 @@ - (void)animateCollectionView:(UICollectionView *)collectionView show:(BOOL)show
             collectionView.frame = CGRectMake(_origin.x, self.frame.origin.y + self.frame.size.height, self.frame.size.width, 0);
             [self.superview addSubview:collectionView];
             
-            collectionViewHeight = ([collectionView numberOfItemsInSection:0] > 10) ? (5 * 38) : (ceil([collectionView numberOfItemsInSection:0]/2) * 38);
+//            collectionViewHeight = ([collectionView numberOfItemsInSection:0] > 10) ? (5 * 38) : (ceil([collectionView numberOfItemsInSection:0]/2) * 38);
+            // fix if collectionView numberOfItemsInSection > 10 or numberOfItemsInSection / 2 != 0
+            collectionViewHeight =ceil((CGFloat)[collectionView numberOfItemsInSection:0]/2.0) * 38;
         }
         
         [UIView animateWithDuration:0.2 animations:^{