diff --git a/lms/envs/aws.py b/lms/envs/aws.py
index 71fab6d6e7db8a65abee3c875ecb671a1757f352..793a6e943483968bd63c0faa37f09c8a69e2b48b 100644
--- a/lms/envs/aws.py
+++ b/lms/envs/aws.py
@@ -604,7 +604,8 @@ if FEATURES.get('ENABLE_OAUTH2_PROVIDER'):
         days=ENV_TOKENS.get('OAUTH_EXPIRE_CONFIDENTIAL_CLIENT_DAYS', OAUTH_EXPIRE_CONFIDENTIAL_CLIENT_DAYS)
     )
     OAUTH_EXPIRE_DELTA_PUBLIC = datetime.timedelta(
-        days=ENV_TOKENS['OAUTH_EXPIRE_PUBLIC_CLIENT_DAYS', OAUTH_EXPIRE_PUBLIC_CLIENT_DAYS])
+        days=ENV_TOKENS.get('OAUTH_EXPIRE_PUBLIC_CLIENT_DAYS', OAUTH_EXPIRE_PUBLIC_CLIENT_DAYS)
+    )
 
 
 ##### ADVANCED_SECURITY_CONFIG #####