diff --git a/src/libraries/System.Net.WebSockets.Client/tests/wasm/System.Net.WebSockets.Client.Wasm.Tests.csproj b/src/libraries/System.Net.WebSockets.Client/tests/wasm/System.Net.WebSockets.Client.Wasm.Tests.csproj
index cd8f38fab54b42..9be8ef0fb7c9ab 100644
--- a/src/libraries/System.Net.WebSockets.Client/tests/wasm/System.Net.WebSockets.Client.Wasm.Tests.csproj
+++ b/src/libraries/System.Net.WebSockets.Client/tests/wasm/System.Net.WebSockets.Client.Wasm.Tests.csproj
@@ -5,6 +5,7 @@
     <StringResourcesPath>../../src/Resources/Strings.resx</StringResourcesPath>
     <TargetFramework>$(NetCoreAppCurrent)-browser</TargetFramework>
     <DefineConstants>$(DefineConstants);NETSTANDARD</DefineConstants>
+    <NoWarn>$(NoWarn);SYSLIB0057</NoWarn>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetOS)' == 'browser'">