diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
index 0572d1dd207619..3e4dd7a8898627 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Compiles.cs
@@ -343,6 +343,7 @@ public static IEnumerable<object[]> CodeSnippetsToValidateFallbackForwarder()
         }
 
         [ConditionalTheory]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/63635", TestPlatforms.OSX)]
         [MemberData(nameof(CodeSnippetsToValidateFallbackForwarder))]
         public async Task ValidateSnippetsFallbackForwarder(string source, TestTargetFramework targetFramework, bool expectFallbackForwarder)
         {
diff --git a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
index 135bfe5224198e..78cc443f9d605e 100644
--- a/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
+++ b/src/libraries/System.Runtime.InteropServices/tests/DllImportGenerator.UnitTests/Diagnostics.cs
@@ -17,6 +17,7 @@ namespace DllImportGenerator.UnitTests
     public class Diagnostics
     {
         [ConditionalTheory]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/63635", TestPlatforms.OSX)]
         [InlineData(TestTargetFramework.Framework)]
         [InlineData(TestTargetFramework.Core)]
         [InlineData(TestTargetFramework.Standard)]
@@ -43,6 +44,7 @@ partial class Test
         }
 
         [ConditionalTheory]
+        [ActiveIssue("https://github.com/dotnet/runtime/issues/63635", TestPlatforms.OSX)]
         [InlineData(TestTargetFramework.Framework)]
         [InlineData(TestTargetFramework.Core)]
         [InlineData(TestTargetFramework.Standard)]