diff --git a/src/libraries/tests.proj b/src/libraries/tests.proj
index f82a4d7f24bc80..b4bed0e83f43d5 100644
--- a/src/libraries/tests.proj
+++ b/src/libraries/tests.proj
@@ -531,6 +531,11 @@
                        Include="@(HighAOTResourceRequiringProject)" />
   </ItemGroup>
 
+  <ItemGroup>
+      <!-- FunctionalTests TestAssets are not, themselves, tests. -->
+      <ProjectExclusions Include="$(RepoRoot)\src\tests\FunctionalTests\TestAssets\**\*.csproj" />
+  </ItemGroup>
+
   <ItemGroup>
     <SmokeTestProject Include="$(MSBuildThisFileDirectory)System.Runtime\tests\System.Runtime.Tests.csproj" />
     <GrpcTestProject Include="$(RepoRoot)\src\tests\FunctionalTests\Android\Device_Emulator\gRPC\Android.Device_Emulator.gRPC.Test.csproj" />