diff --git a/src/edge_tts/constants.py b/src/edge_tts/constants.py
index a529162..e31823e 100644
--- a/src/edge_tts/constants.py
+++ b/src/edge_tts/constants.py
@@ -6,4 +6,4 @@
 BASE_URL = "speech.platform.bing.com/consumer/speech/synthesize"
 
 WSS_URL = f"wss://{BASE_URL}/readaloud/edge/v1?TrustedClientToken={TRUSTED_CLIENT_TOKEN}"
-VOICE_LIST = f"{BASE_URL}/readaloud/voices/list?trustedclienttoken={TRUSTED_CLIENT_TOKEN}"
+VOICE_LIST = f"https://{BASE_URL}/readaloud/voices/list?trustedclienttoken={TRUSTED_CLIENT_TOKEN}"