diff --git a/VegaScroll.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/VegaScroll.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/VegaScroll.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/VegaScroll/Classes/VegaScrollFlowLayout.swift b/VegaScroll/Classes/VegaScrollFlowLayout.swift
index 7d335ce..bbc470d 100644
--- a/VegaScroll/Classes/VegaScrollFlowLayout.swift
+++ b/VegaScroll/Classes/VegaScrollFlowLayout.swift
@@ -119,7 +119,7 @@ open class VegaScrollFlowLayout: UICollectionViewFlowLayout {
         
         let touchLocation = collectionView!.panGestureRecognizer.location(in: collectionView)
         
-        dynamicAnimator.behaviors.flatMap { $0 as? UIAttachmentBehavior }.forEach { behavior in
+        dynamicAnimator.behaviors.compactMap { $0 as? UIAttachmentBehavior }.forEach { behavior in
             let attrs = behavior.items.first as! UICollectionViewLayoutAttributes
             attrs.center = getUpdatedBehaviorItemCenter(behavior: behavior, touchLocation: touchLocation)
             self.dynamicAnimator.updateItem(usingCurrentState: attrs)