diff --git a/src/ankisyncd/sync_app.py b/src/ankisyncd/sync_app.py
index 9a41b0e..0baa830 100644
--- a/src/ankisyncd/sync_app.py
+++ b/src/ankisyncd/sync_app.py
@@ -499,7 +499,7 @@ class SyncApp:
     def __call__(self, req):
         # Get and verify the session
         try:
-            hkey = req.POST['k']
+            hkey = req.params['k']
         except KeyError:
             hkey = None