diff --git a/tests/console/commands/self/test_remove_plugins.py b/tests/console/commands/self/test_remove_plugins.py
index 2b988443469..3c5725109e8 100644
--- a/tests/console/commands/self/test_remove_plugins.py
+++ b/tests/console/commands/self/test_remove_plugins.py
@@ -4,6 +4,7 @@
 
 import pytest
 import tomlkit
+from tomlkit.toml_file import TOMLFile
 
 from poetry.core.packages.dependency import Dependency
 from poetry.core.packages.package import Package
@@ -37,7 +38,8 @@ def install_plugin(installed: Repository) -> None:
     )
     content = Factory.create_pyproject_from_package(package)
     system_pyproject_file = SelfCommand.get_default_system_pyproject_file()
-    system_pyproject_file.write_text(content.as_string(), encoding="utf-8")
+    toml_file = TOMLFile(system_pyproject_file)
+    toml_file.write(content)
 
     lock_content = {
         "package": [