diff --git a/tests/data/packages/README.txt b/tests/data/packages/README.txt
index aa957b337f0..37860a21b9e 100644
--- a/tests/data/packages/README.txt
+++ b/tests/data/packages/README.txt
@@ -6,9 +6,9 @@ broken-0.1.tar.gz
 -----------------
 This package exists for testing uninstall-rollback.
 
-broken-0.2broken.tar.gz
------------------------
-Version 0.2broken has a setup.py crafted to fail on install (and only on
+broken-0.2+broken.tar.gz
+------------------------
+Version 0.2+broken has a setup.py crafted to fail on install (and only on
 install). If any earlier step would fail (i.e. egg-info-generation), the
 already-installed version would never be uninstalled, so uninstall-rollback
 would not come into play.
diff --git a/tests/data/packages/broken-0.2broken.tar.gz b/tests/data/packages/broken-0.2+broken.tar.gz
similarity index 100%
rename from tests/data/packages/broken-0.2broken.tar.gz
rename to tests/data/packages/broken-0.2+broken.tar.gz
diff --git a/tests/functional/test_install_upgrade.py b/tests/functional/test_install_upgrade.py
index 09c01d7eb18..ea97477b555 100644
--- a/tests/functional/test_install_upgrade.py
+++ b/tests/functional/test_install_upgrade.py
@@ -295,7 +295,7 @@ def test_uninstall_rollback(script: PipTestEnvironment, data: TestData) -> None:
         "-f",
         data.find_links,
         "--no-index",
-        "broken===0.2broken",
+        "broken===0.2+broken",
         expect_error=True,
     )
     assert result2.returncode == 1, str(result2)