diff --git a/src/uncategorized/seBirth.tw b/src/uncategorized/seBirth.tw
index 2ce44efffba2f096055654f89749e0c0b7ad0e0a..dc783e56ed32c9b834a0629708c93fccc2c2b927 100644
--- a/src/uncategorized/seBirth.tw
+++ b/src/uncategorized/seBirth.tw
@@ -23,7 +23,7 @@ I need to break single passage to several widgets, as it's been overcomplicated
 
 <<for $i to 0; $i < $slaves.length; $i++>>
 	<<if $slaves[$i].labor == 1>>
-		<<if undef $slaves[$i].laborCount>>
+		<<if ndef $slaves[$i].laborCount>>
 			<<set $slaves[$i].laborCount = 0>>
 			<<if $slaves[$i].birthsTotal > 0 && $slaves[$i].laborCount == 0>>
 				<<set $slaves[$i].laborCount = $slaves[$i].birthsTotal>> /*we do not have a way to know multiples birth count for backward compatibility code. :( */