diff --git a/msix/ubuntu-pro-agent-launcher/error.cpp b/msix/ubuntu-pro-agent-launcher/error.cpp
index 009e7d111..fcc312c60 100644
--- a/msix/ubuntu-pro-agent-launcher/error.cpp
+++ b/msix/ubuntu-pro-agent-launcher/error.cpp
@@ -30,7 +30,7 @@ void LogSingleShot(std::filesystem::path const& logFilePath,
   auto const time =
       std::chrono::current_zone()->to_local(std::chrono::system_clock::now());
 
-  std::ofstream logfile{logFilePath};
+  std::ofstream logfile{logFilePath, std::ios::app};
   logfile << std::format("{:%Y-%m-%d %T}: {}\n", time, message);
 }