diff --git a/dsmr_parser/clients/protocol.py b/dsmr_parser/clients/protocol.py
index 88b25fb..45f6d48 100644
--- a/dsmr_parser/clients/protocol.py
+++ b/dsmr_parser/clients/protocol.py
@@ -35,7 +35,7 @@ def create_dsmr_protocol(dsmr_version, telegram_callback, loop=None, **kwargs):
     elif dsmr_version == "5S":
         specification = telegram_specifications.SWEDEN
         serial_settings = SERIAL_SETTINGS_V5
-    elif dsmr_version == 'Q3D":
+    elif dsmr_version == "Q3D":
         specification = telegram_specifications.Q3D
         serial_settings = SERIAL_SETTINGS_V5
     else: