diff --git a/modules/playready.py b/modules/playready.py
index ae1e78a..b415a6a 100644
--- a/modules/playready.py
+++ b/modules/playready.py
@@ -24,7 +24,7 @@ class PLAYREADY:
 
     def get_license_challenge(self):
         device = Device.load(self.device)
-        cdm = Cdm.from_device(self.device)
+        cdm = Cdm.from_device(device)
         pssh = PSSH(self.pssh)
         wrm_headers = pssh.get_wrm_headers(downgrade_to_v4=False)
         raw_challenge = cdm.get_license_challenge(wrm_headers[0])
@@ -67,4 +67,4 @@ class PLAYREADY:
             return jsonify(key_pairs)
 
         except Exception as e:
-            return jsonify({"error": f"Unable to extract keys: {e}"}), 500
\ No newline at end of file
+            return jsonify({"error": f"Unable to extract keys: {e}"}), 500