diff --git a/src/Route/Download.php b/src/Route/Download.php
index 8233391..a936b29 100644
--- a/src/Route/Download.php
+++ b/src/Route/Download.php
@@ -39,7 +39,7 @@ class Download implements Route {
 	 *
 	 * @var string
 	 */
-	const PACKAGE_SLUG_REGEX = '/[^A-Za-z0-9_\-]+/i';
+	const PACKAGE_SLUG_REGEX = '/[^A-Za-z0-9._\-]+/i';
 
 	/**
 	 * Regex for sanitizing package versions.