diff --git a/lti_consumer/lti_1p3/consumer.py b/lti_consumer/lti_1p3/consumer.py
index fbc5cc303fa09d32a56f15841c19f2281843316d..bb1efa72e5f4049c2381207a39ce0980f9085d44 100644
--- a/lti_consumer/lti_1p3/consumer.py
+++ b/lti_consumer/lti_1p3/consumer.py
@@ -251,9 +251,7 @@ class LtiConsumer1p3:
             "iss": self.iss,
 
             # JWT aud and azp
-            "aud": [
-                self.client_id
-            ],
+            "aud": self.client_id,
             "azp": self.client_id,
 
             # LTI Deployment ID Claim: