diff --git a/eng/SourceBuild.props b/eng/SourceBuild.props
index c4009f33b6..c963035e0b 100644
--- a/eng/SourceBuild.props
+++ b/eng/SourceBuild.props
@@ -3,6 +3,7 @@
   <PropertyGroup>
     <GitHubRepositoryName>emsdk</GitHubRepositoryName>
     <SourceBuildManagedOnly>true</SourceBuildManagedOnly>
+    <SourceBuildTrimNetFrameworkTargets>true</SourceBuildTrimNetFrameworkTargets>
   </PropertyGroup>
 
 </Project>