diff --git a/tst/passthrough-dotnet/.gitignore b/tst/passthrough-dotnet/.gitignore
index c78dfb19..c23cca77 100644
--- a/tst/passthrough-dotnet/.gitignore
+++ b/tst/passthrough-dotnet/.gitignore
@@ -3,3 +3,4 @@ build
 *.suo
 *.vcproj.*
 *.vcxproj.user
+*.csproj.user