diff --git a/physics/views.py b/physics/views.py
index a9bfb0a0..aae4c58d 100644
--- a/physics/views.py
+++ b/physics/views.py
@@ -355,7 +355,7 @@ def exam_take(request, pk, sk, cid, passcode=None):
             "pk": pk,
             "cid" : cid
         }
-        if passcode is None:
+        if passcode is not None:
             kwargs["passcode"] = passcode
 
         if "next" in request.POST: