diff --git a/src/Calculator/Package.Release.appxmanifest b/src/Calculator/Package.Release.appxmanifest
index 8008ca30..51674f74 100644
--- a/src/Calculator/Package.Release.appxmanifest
+++ b/src/Calculator/Package.Release.appxmanifest
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
-<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5" IgnorableNamespaces="uap uap5 mp">
+<Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10" xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest" xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10" xmlns:uap3="http://schemas.microsoft.com/appx/manifest/uap/windows10/3" xmlns:uap5="http://schemas.microsoft.com/appx/manifest/uap/windows10/5" IgnorableNamespaces="uap uap3 uap5 mp">
     <Identity Name="Microsoft.WindowsCalculator" Publisher="CN=Microsoft Corporation, O=Microsoft Corporation, L=Redmond, S=Washington, C=US" Version="10.1604.27012.0" />
     <mp:PhoneIdentity PhoneProductId="b58171c6-c70c-4266-a2e8-8f9c994f4456" PhonePublisherId="95d94207-0c7c-47ed-82db-d75c81153c35" />
     <Properties>
@@ -36,6 +36,17 @@
                         <uap:Logo>Assets\CalculatorAppList.png</uap:Logo>
                     </uap:Protocol>
                 </uap:Extension>
+                <uap3:Extension Category="windows.appExtension">
+                    <uap3:AppExtension Name="com.microsoft.windows.dontmaximizeonsmallscreen"
+                                       Id="calculator"
+                                       DisplayName="calculator"
+                                       Description="This app extension makes calculator no longer maximizing by default on small screen device."
+                                       PublicFolder="Public">
+                        <uap3:Properties>
+                            <Service>com.microsoft.windows.dontmaximizeonsmallscreen</Service>
+                        </uap3:Properties>
+                    </uap3:AppExtension>
+                </uap3:Extension>
             </Extensions>
         </Application>
     </Applications>