diff --git a/DeviceLayout.podspec b/DeviceLayout.podspec
index d315b69..ade8436 100644
--- a/DeviceLayout.podspec
+++ b/DeviceLayout.podspec
@@ -8,7 +8,7 @@
 
 Pod::Spec.new do |s|
   s.name             = 'DeviceLayout'
-  s.version          = '0.1.1'
+  s.version          = '0.1.2'
   s.summary          = 'Auto Layout can be set differently for each device.'
 
 # This description is used to generate tags and improve search results.
diff --git a/Example/DeviceLayout/Base.lproj/Main.storyboard b/Example/DeviceLayout/Base.lproj/Main.storyboard
index 0401a10..7f97ab0 100644
--- a/Example/DeviceLayout/Base.lproj/Main.storyboard
+++ b/Example/DeviceLayout/Base.lproj/Main.storyboard
@@ -173,7 +173,7 @@
                                         <real key="value" value="-110"/>
                                     </userDefinedRuntimeAttribute>
                                     <userDefinedRuntimeAttribute type="number" keyPath="inch12_9">
-                                        <real key="value" value="-12"/>
+                                        <real key="value" value="-120"/>
                                     </userDefinedRuntimeAttribute>
                                 </userDefinedRuntimeAttributes>
                             </constraint>
diff --git a/Sources/DeviceLayoutConstraint.swift b/Sources/DeviceLayoutConstraint.swift
index 02f2ec8..c201086 100644
--- a/Sources/DeviceLayoutConstraint.swift
+++ b/Sources/DeviceLayoutConstraint.swift
@@ -28,7 +28,7 @@ class DeviceLayoutConstraint: NSLayoutConstraint {
     }
     
     open func deviceSize() -> Size {
-        return Device.size()
+        return Device.deviceSize
     }
     
     open func layoutIfNeeded() {
@@ -36,3 +36,7 @@ class DeviceLayoutConstraint: NSLayoutConstraint {
         self.secondItem?.layoutIfNeeded()
     }
 }
+
+fileprivate extension Device {
+    static let deviceSize = Device.size()
+}