diff --git a/nuget.config b/nuget.config
index f84cf977..0b9f7097 100644
--- a/nuget.config
+++ b/nuget.config
@@ -1,8 +1,16 @@
 <?xml version="1.0" encoding="utf-8"?>
 <configuration>
-    <packageSources>
-        <clear />
-        <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
-        <add key="CommandLineNightly" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json" />
-    </packageSources>
+  <packageSources>
+    <clear />
+    <add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
+    <add key="CommandLineNightly" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries/nuget/v3/index.json" />
+  </packageSources>
+  <packageSourceMapping>
+    <packageSource key="CommandLineNightly">
+      <package pattern="System.CommandLine" />
+    </packageSource>
+    <packageSource key="NuGet.org">
+      <package pattern="*" />
+    </packageSource>
+  </packageSourceMapping>
 </configuration>
\ No newline at end of file