diff --git a/ortools/dotnet/Sample.csproj.in b/ortools/dotnet/Sample.csproj.in
index 9b28387357..cc7c8589eb 100644
--- a/ortools/dotnet/Sample.csproj.in
+++ b/ortools/dotnet/Sample.csproj.in
@@ -41,7 +41,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Include="@SAMPLE_FILE_NAME@" />
+    <Compile Include="@SAMPLE_NAME@.cs" />
     <PackageReference Include="@DOTNET_PROJECT@" Version="@PROJECT_VERSION_MAJOR@.@PROJECT_VERSION_MINOR@.*" />
   </ItemGroup>
 </Project>
diff --git a/ortools/dotnet/Test.csproj.in b/ortools/dotnet/Test.csproj.in
index 9dd2471eca..828f815baa 100644
--- a/ortools/dotnet/Test.csproj.in
+++ b/ortools/dotnet/Test.csproj.in
@@ -32,7 +32,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <Compile Include="@TEST_FILE_NAME@" />
+    <Compile Include="@TEST_NAME@.cs" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
     <PackageReference Include="xunit" Version="2.8.2" />
     <PackageReference Include="xunit.runner.console" Version="2.8.2" />