diff --git a/src/fsfw_hal/host/HostFilesystem.cpp b/src/fsfw_hal/host/HostFilesystem.cpp
index 315ba422..f9f3bdd6 100644
--- a/src/fsfw_hal/host/HostFilesystem.cpp
+++ b/src/fsfw_hal/host/HostFilesystem.cpp
@@ -165,7 +165,8 @@ ReturnValue_t HostFilesystem::truncateFile(FilesystemParams params) {
   if (not filesystem::exists(path, e)) {
     return FILE_DOES_NOT_EXIST;
   }
-  ofstream of(path);
+  // Specify truncaion flug explicitely.
+  ofstream of(path, std::ios::out | std::ios::trunc);
   return returnvalue::OK;
 }