diff --git a/homeassistant/components/tts/__init__.py b/homeassistant/components/tts/__init__.py
index 6d667563ac9..a90a69edcdb 100644
--- a/homeassistant/components/tts/__init__.py
+++ b/homeassistant/components/tts/__init__.py
@@ -101,7 +101,7 @@ _RE_LEGACY_VOICE_FILE = re.compile(
     r"([a-f0-9]{40})_([^_]+)_([^_]+)_([a-z_]+)\.[a-z0-9]{3,4}"
 )
 _RE_VOICE_FILE = re.compile(
-    r"([a-f0-9]{40})_([^_]+)_([^_]+)_(tts\.[a-z_]+)\.[a-z0-9]{3,4}"
+    r"([a-f0-9]{40})_([^_]+)_([^_]+)_(tts\.[a-z0-9_]+)\.[a-z0-9]{3,4}"
 )
 KEY_PATTERN = "{0}_{1}_{2}_{3}"