diff --git a/src/libraries/System.IO.Compression.Brotli/src/System.IO.Compression.Brotli.csproj b/src/libraries/System.IO.Compression.Brotli/src/System.IO.Compression.Brotli.csproj
index 124cd52bc84993..a4ab3c17643994 100644
--- a/src/libraries/System.IO.Compression.Brotli/src/System.IO.Compression.Brotli.csproj
+++ b/src/libraries/System.IO.Compression.Brotli/src/System.IO.Compression.Brotli.csproj
@@ -6,6 +6,13 @@
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TargetOS)' != 'browser'
+    and '$(TargetOS)' != 'wasi'
+    and '$(RuntimeFlavor)' != 'Mono'">
+    <NoWarn>$(NoWarn);CA2252</NoWarn>
+    <Features>$(Features);runtime-async=on</Features>
+  </PropertyGroup>
+
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
     <TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>
diff --git a/src/libraries/System.IO.Compression/src/System.IO.Compression.csproj b/src/libraries/System.IO.Compression/src/System.IO.Compression.csproj
index 91ad2914646cd3..1f01251d6050f6 100644
--- a/src/libraries/System.IO.Compression/src/System.IO.Compression.csproj
+++ b/src/libraries/System.IO.Compression/src/System.IO.Compression.csproj
@@ -7,6 +7,13 @@
     <GenAPIExcludeApiList>ReferenceAssemblyExclusions.txt</GenAPIExcludeApiList>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TargetOS)' != 'browser'
+    and '$(TargetOS)' != 'wasi'
+    and '$(RuntimeFlavor)' != 'Mono'">
+    <NoWarn>$(NoWarn);CA2252</NoWarn>
+    <Features>$(Features);runtime-async=on</Features>
+  </PropertyGroup>
+
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
     <TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>
diff --git a/src/libraries/System.Net.WebSockets/src/System.Net.WebSockets.csproj b/src/libraries/System.Net.WebSockets/src/System.Net.WebSockets.csproj
index 4b1229be09da56..3e5221752ee3ce 100644
--- a/src/libraries/System.Net.WebSockets/src/System.Net.WebSockets.csproj
+++ b/src/libraries/System.Net.WebSockets/src/System.Net.WebSockets.csproj
@@ -6,6 +6,13 @@
     <UseCompilerGeneratedDocXmlFile>false</UseCompilerGeneratedDocXmlFile>
   </PropertyGroup>
 
+  <PropertyGroup Condition="'$(TargetOS)' != 'browser'
+    and '$(TargetOS)' != 'wasi'
+    and '$(RuntimeFlavor)' != 'Mono'">
+    <NoWarn>$(NoWarn);CA2252</NoWarn>
+    <Features>$(Features);runtime-async=on</Features>
+  </PropertyGroup>
+
   <!-- DesignTimeBuild requires all the TargetFramework Derived Properties to not be present in the first property group. -->
   <PropertyGroup>
     <TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>