diff --git a/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/LicenseExclusions.txt b/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/LicenseExclusions.txt
index edbf642f0..f2f5e9e9c 100644
--- a/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/LicenseExclusions.txt
+++ b/src/SourceBuild/content/test/Microsoft.DotNet.SourceBuild.SmokeTests/assets/LicenseExclusions.txt
@@ -274,13 +274,6 @@ src/vstest/src/Microsoft.TestPlatform.Extensions.BlameDataCollector/ProcDumpArgs
 src/vstest/src/package/Microsoft.CodeCoverage/ThirdPartyNoticesCodeCoverage.txt
 src/vstest/src/package/Microsoft.VisualStudio.TestTools.TestPlatform.V2.CLI/License.rtf
 
-#
-# winforms
-#
-
-# ISSUE: Winforms repo bringing in a non-open source license (https://github.com/dotnet/source-build/issues/3772)
-src/winforms/src/System.Windows.Forms/tests/IntegrationTests/DesignSurface/LICENSE.txt
-
 #
 # wpf
 #
diff --git a/src/VirtualMonoRepo/source-mappings.json b/src/VirtualMonoRepo/source-mappings.json
index c6a44e0a3..b1cf306d4 100644
--- a/src/VirtualMonoRepo/source-mappings.json
+++ b/src/VirtualMonoRepo/source-mappings.json
@@ -186,7 +186,11 @@
         },
         {
             "name": "winforms",
-            "defaultRemote": "https://github.com/dotnet/winforms"
+            "defaultRemote": "https://github.com/dotnet/winforms",
+            "exclude": [
+                // Non-OSS license - https://github.com/dotnet/source-build/issues/3772
+                "src/System.Windows.Forms/tests/IntegrationTests/DesignSurface/**"
+            ]
         },
         {
             "name": "wpf",