diff --git a/src/tox/package/local.py b/src/tox/package/local.py
index d404319a2b..2acb3895f0 100644
--- a/src/tox/package/local.py
+++ b/src/tox/package/local.py
@@ -49,7 +49,7 @@ def get_latest_version_of_package(package_spec):
         return candidates[0]
 
 
-_REGEX_FILE_NAME_WITH_VERSION = re.compile(r"[\w_\-+.]+-(.*)\.(zip|tar\.gz)")
+_REGEX_FILE_NAME_WITH_VERSION = re.compile(r"[-\w_+.]+-(.*)\.(zip|tar\.gz)")
 
 
 def get_version_from_filename(basename):