diff --git a/development/autotests/filterCheckWarnings b/development/autotests/filterCheckWarnings
index fc6925d928..af5c078347 100644
--- a/development/autotests/filterCheckWarnings
+++ b/development/autotests/filterCheckWarnings
@@ -1,3 +1,4 @@
 Cannot find translation for language
 Warning: Lyx2lyx knows nothing about (textclass|module) 
 Warning: sfval: [0-9]+ [0-9]+
+Warning: a buffer should not have two parents!