diff --git a/custom_components/openai_tts/config_flow.py b/custom_components/openai_tts/config_flow.py
index 6df6fd9..0afdb14 100644
--- a/custom_components/openai_tts/config_flow.py
+++ b/custom_components/openai_tts/config_flow.py
@@ -17,7 +17,8 @@
 
 async def validate_input(user_input: dict):
     """ Function to validate provided  data"""
-    if len(user_input[CONF_API_KEY]) != 51:
+    api_key_length = len(user_input['CONF_API_KEY'])
+    if not (51 <= api_key_length <= 56):
         raise WrongAPIKey