diff --git a/src/Directory.Packages.props b/src/Directory.Packages.props
index e84ea1c..9b98cad 100644
--- a/src/Directory.Packages.props
+++ b/src/Directory.Packages.props
@@ -2,6 +2,8 @@
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
+    <!-- We are not using package source mapping. -->
+    <NoWarn>$(NoWarn);NU1507</NoWarn>
     <_RoslynVersion>4.14.0</_RoslynVersion>
   </PropertyGroup>
   <ItemGroup>