diff --git a/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj b/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
index 16b03d23..f655dc6e 100644
--- a/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
+++ b/test/CommandLineUtils.Tests/McMaster.Extensions.CommandLineUtils.Tests.csproj
@@ -38,7 +38,11 @@
 
   <ItemGroup>
     <None Update="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-    <None Update="app.config" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
+  <!-- Copy app.config with correct name for .NET Framework test runner -->
+  <Target Name="CopyAppConfigForNet472" AfterTargets="Build" Condition="'$(TargetFramework)' == 'net472'">
+    <Copy SourceFiles="app.config" DestinationFiles="$(OutputPath)$(AssemblyName).dll.config" SkipUnchangedFiles="true" />
+  </Target>
+
 </Project>
diff --git a/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj b/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
index 50118408..cc3a1cbb 100644
--- a/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
+++ b/test/Hosting.CommandLine.Tests/McMaster.Extensions.Hosting.CommandLine.Tests.csproj
@@ -37,7 +37,11 @@
 
   <ItemGroup>
     <None Update="xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />
-    <None Update="app.config" CopyToOutputDirectory="PreserveNewest" />
   </ItemGroup>
 
+  <!-- Copy app.config with correct name for .NET Framework test runner -->
+  <Target Name="CopyAppConfigForNet472" AfterTargets="Build" Condition="'$(TargetFramework)' == 'net472'">
+    <Copy SourceFiles="app.config" DestinationFiles="$(OutputPath)$(AssemblyName).dll.config" SkipUnchangedFiles="true" />
+  </Target>
+
 </Project>