diff --git a/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj b/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj
index 4c953e51ddb7a8..16016d184700d7 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj
+++ b/src/libraries/System.Runtime.InteropServices/tests/ComInterfaceGenerator.Tests/ComInterfaceGenerator.Tests.csproj
@@ -2,6 +2,8 @@
 
   <PropertyGroup>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <!-- NativeExports dependency makes this project platform-specific -->
+    <RuntimeIdentifier>$(TargetRid)</RuntimeIdentifier>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <ReferencesNativeExports>true</ReferencesNativeExports>
     <IncludeRemoteExecutor>true</IncludeRemoteExecutor>
diff --git a/src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/LibraryImportGenerator.Tests.csproj b/src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/LibraryImportGenerator.Tests.csproj
index 47c6ab7ff8ed22..8e99f4edd9dc0c 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/LibraryImportGenerator.Tests.csproj
+++ b/src/libraries/System.Runtime.InteropServices/tests/LibraryImportGenerator.Tests/LibraryImportGenerator.Tests.csproj
@@ -1,6 +1,8 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <TargetFramework>$(NetCoreAppCurrent)</TargetFramework>
+    <!-- NativeExports dependency makes this project platform-specific -->
+    <RuntimeIdentifier>$(TargetRid)</RuntimeIdentifier>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <ReferencesNativeExports>true</ReferencesNativeExports>
     <EmitCompilerGeneratedFiles>true</EmitCompilerGeneratedFiles>