diff --git a/src/libraries/System.Net.Sockets/tests/FunctionalTests/ILLink.Descriptors.xml b/src/libraries/System.Net.Sockets/tests/FunctionalTests/ILLink.Descriptors.xml
new file mode 100644
index 00000000000000..a463351bf87227
--- /dev/null
+++ b/src/libraries/System.Net.Sockets/tests/FunctionalTests/ILLink.Descriptors.xml
@@ -0,0 +1,3 @@
+<linker>
+  <assembly fullname="StreamConformanceTests" />
+</linker>
diff --git a/src/libraries/System.Net.Sockets/tests/FunctionalTests/System.Net.Sockets.Tests.csproj b/src/libraries/System.Net.Sockets/tests/FunctionalTests/System.Net.Sockets.Tests.csproj
index 6fdc8aa36a6974..8b34188f0fc5a7 100644
--- a/src/libraries/System.Net.Sockets/tests/FunctionalTests/System.Net.Sockets.Tests.csproj
+++ b/src/libraries/System.Net.Sockets/tests/FunctionalTests/System.Net.Sockets.Tests.csproj
@@ -114,5 +114,6 @@
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(CommonTestPath)StreamConformanceTests\StreamConformanceTests.csproj" />
+    <TrimmerRootDescriptor Condition="'$(TargetsAppleMobile)' == 'true' and '$(EnableAggressiveTrimming)' == 'true' and '$(UseNativeAotRuntime)' != 'true'" Include="$(MSBuildThisFileDirectory)ILLink.Descriptors.xml" />
   </ItemGroup>
 </Project>
diff --git a/src/libraries/System.Security.Cryptography/tests/ILLink.Descriptors.xml b/src/libraries/System.Security.Cryptography/tests/ILLink.Descriptors.xml
new file mode 100644
index 00000000000000..a463351bf87227
--- /dev/null
+++ b/src/libraries/System.Security.Cryptography/tests/ILLink.Descriptors.xml
@@ -0,0 +1,3 @@
+<linker>
+  <assembly fullname="StreamConformanceTests" />
+</linker>
diff --git a/src/libraries/System.Security.Cryptography/tests/System.Security.Cryptography.Tests.csproj b/src/libraries/System.Security.Cryptography/tests/System.Security.Cryptography.Tests.csproj
index f490702df59f7b..0f83a6317608a7 100644
--- a/src/libraries/System.Security.Cryptography/tests/System.Security.Cryptography.Tests.csproj
+++ b/src/libraries/System.Security.Cryptography/tests/System.Security.Cryptography.Tests.csproj
@@ -872,6 +872,7 @@
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="$(CommonTestPath)StreamConformanceTests\StreamConformanceTests.csproj" />
+    <TrimmerRootDescriptor Condition="'$(TargetsAppleMobile)' == 'true' and '$(EnableAggressiveTrimming)' == 'true' and '$(UseNativeAotRuntime)' != 'true'" Include="$(MSBuildThisFileDirectory)ILLink.Descriptors.xml" />
     <ProjectReference Include="$(LibrariesProjectRoot)System.Security.Cryptography.Pkcs\src\System.Security.Cryptography.Pkcs.csproj" />
     <PackageReference Include="System.Security.Cryptography.X509Certificates.TestData" Version="$(SystemSecurityCryptographyX509CertificatesTestDataVersion)" />
     <!-- Reference the `NetCoreAppMinimum` build which has a functional BinaryFormatter and force a private copy to ensure it's not excluded -->