diff --git a/src/common/msi_to_msix_upgrade_lib/msi_to_msix_upgrade_lib.vcxproj b/src/common/msi_to_msix_upgrade_lib/msi_to_msix_upgrade_lib.vcxproj
index 26f9cc00fc..b0e4168daa 100644
--- a/src/common/msi_to_msix_upgrade_lib/msi_to_msix_upgrade_lib.vcxproj
+++ b/src/common/msi_to_msix_upgrade_lib/msi_to_msix_upgrade_lib.vcxproj
@@ -89,7 +89,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <SDLCheck>true</SDLCheck>
@@ -131,7 +131,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
       <PrecompiledHeader>Use</PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ConformanceMode>true</ConformanceMode>
diff --git a/src/common/msi_to_msix_upgrade_lib/pch.h b/src/common/msi_to_msix_upgrade_lib/pch.h
index d3445d47d1..3b153d0513 100644
--- a/src/common/msi_to_msix_upgrade_lib/pch.h
+++ b/src/common/msi_to_msix_upgrade_lib/pch.h
@@ -3,7 +3,9 @@
 #ifndef PCH_H
 #define PCH_H
 
+#pragma warning (disable: 5205)
 #include <winrt/base.h>
+#pragma warning (default: 5205)
 #include <Windows.h>
 #include <MsiQuery.h>
 #include <Shlwapi.h>
diff --git a/src/common/notifications_winrt/BackgroundHandler.idl b/src/common/notifications_winrt/BackgroundHandler.idl
index 9a85cb8c0d..528ff5c57f 100644
--- a/src/common/notifications_winrt/BackgroundHandler.idl
+++ b/src/common/notifications_winrt/BackgroundHandler.idl
@@ -1,11 +1,10 @@
 namespace PowerToysNotifications
 {
     [version(1)]
-    [default_interface]
-    runtimeclass BackgroundHandler : Windows.ApplicationModel.Background.IBackgroundTask
+    runtimeclass BackgroundHandler
     {
         BackgroundHandler();
-        
+    
         void Run(Windows.ApplicationModel.Background.IBackgroundTaskInstance taskInstance);
     }
 }