diff --git a/src/libraries/System.Resources.Extensions/tests/BinaryResourceWriterUnitTest.cs b/src/libraries/System.Resources.Extensions/tests/BinaryResourceWriterUnitTest.cs
index a98ccea1bc2dd7..c6061a82de2b86 100644
--- a/src/libraries/System.Resources.Extensions/tests/BinaryResourceWriterUnitTest.cs
+++ b/src/libraries/System.Resources.Extensions/tests/BinaryResourceWriterUnitTest.cs
@@ -262,7 +262,7 @@ public static void PrimitiveResourcesAsStrings()
             }
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34495", TestPlatforms.Windows, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34008", TestPlatforms.Linux, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         public static void BinaryFormattedResources()
@@ -300,7 +300,7 @@ public static void BinaryFormattedResources()
             }
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34495", TestPlatforms.Windows, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         [ActiveIssue("https://github.com/dotnet/runtime/issues/34008", TestPlatforms.Linux, TargetFrameworkMonikers.Netcoreapp, TestRuntimes.Mono)]
         public static void BinaryFormattedResourcesWithoutTypeName()
@@ -436,7 +436,7 @@ public static void StreamResources()
             }
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         public static void CanReadViaResourceManager()
         {
             ResourceManager resourceManager = new ResourceManager(typeof(TestData));
@@ -474,7 +474,7 @@ public static void ResourceManagerLoadsCorrectReader()
             Assert.IsType<DeserializingResourceReader>(reader);
         }
 
-        [Fact]
+        [ConditionalFact(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         public static void EmbeddedResourcesAreUpToDate()
         {
             // this is meant to catch a case where our embedded test resources are out of date with respect to the current writer.
diff --git a/src/libraries/System.Resources.ResourceManager/tests/ResourceManagerTests.cs b/src/libraries/System.Resources.ResourceManager/tests/ResourceManagerTests.cs
index ba15e0990a4930..9c038b540e12a2 100644
--- a/src/libraries/System.Resources.ResourceManager/tests/ResourceManagerTests.cs
+++ b/src/libraries/System.Resources.ResourceManager/tests/ResourceManagerTests.cs
@@ -228,7 +228,7 @@ public static IEnumerable<object[]> EnglishNonStringResourceData()
             yield return new object[] { "Size", new Size(20, 30), true };
         }
 
-        [Theory]
+        [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         [MemberData(nameof(EnglishNonStringResourceData))]
         public static void GetObject(string key, object expectedValue, bool requiresBinaryFormatter)
         {
@@ -299,7 +299,7 @@ public static void GetResourceSet_Strings(string key, string expectedValue)
             Assert.Equal(expectedValue, set.GetString(key));
         }
 
-        [Theory]
+        [ConditionalTheory(typeof(PlatformDetection), nameof(PlatformDetection.IsBinaryFormatterSupported))]
         [MemberData(nameof(EnglishNonStringResourceData))]
         public static void GetResourceSet_NonStrings(string key, object expectedValue, bool requiresBinaryFormatter)
         {
diff --git a/src/libraries/tests.proj b/src/libraries/tests.proj
index a84779ea525fb8..b11eb01f25d850 100644
--- a/src/libraries/tests.proj
+++ b/src/libraries/tests.proj
@@ -46,8 +46,6 @@
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Reflection.MetadataLoadContext\tests\System.Reflection.MetadataLoadContext.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Reflection\tests\CoreCLR\System.Reflection.CoreCLR.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Reflection\tests\System.Reflection.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Resources.Extensions\tests\System.Resources.Extensions.Tests.csproj" />
-    <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Resources.ResourceManager\tests\System.Resources.ResourceManager.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Security.Permissions\tests\System.Security.Permissions.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Text.RegularExpressions\tests\System.Text.RegularExpressions.Tests.csproj" />
     <ProjectExclusions Include="$(MSBuildThisFileDirectory)System.Threading.Thread\tests\System.Threading.Thread.Tests.csproj" />