diff --git a/lookup.py b/lookup.py
index 0c0dba2..3e70fdd 100755
--- a/lookup.py
+++ b/lookup.py
@@ -117,7 +117,7 @@ class RequestLookup(object):
         """
         Delete a specific certificate request
         """
-        os.unlink(os.path.join(self.request_dir, request_id))
+        os.unlink(SignRequest(request_id).path))
 
     def __getitem__(self, request_id):
         """