diff --git a/src/libraries/System.Diagnostics.Process/Directory.Build.props b/src/libraries/System.Diagnostics.Process/Directory.Build.props
index d68d22c1b917f8..ce244cbea56199 100644
--- a/src/libraries/System.Diagnostics.Process/Directory.Build.props
+++ b/src/libraries/System.Diagnostics.Process/Directory.Build.props
@@ -3,5 +3,6 @@
   <PropertyGroup>
     <StrongNameKeyId>Microsoft</StrongNameKeyId>
     <IncludePlatformAttributes>true</IncludePlatformAttributes>
+    <UnsupportedOSPlatforms>browser</UnsupportedOSPlatforms>
   </PropertyGroup>
 </Project>
\ No newline at end of file