diff --git a/lib/py/criu.py b/lib/py/criu.py
index 0ae204af9..87257580e 100644
--- a/lib/py/criu.py
+++ b/lib/py/criu.py
@@ -277,6 +277,6 @@ class criu:
 		resp = self._send_req_and_recv_resp(req)
 
 		if not resp.success:
-			raise CRIUExceptionExternal(req.type, resp.type, resp.errno)
+			raise CRIUExceptionExternal(req.type, resp.type, resp.cr_errno)
 
 		return resp.restore