diff --git a/src/uncategorized/BackwardsCompatibility.tw b/src/uncategorized/BackwardsCompatibility.tw
index b175fd682c03376477a860e235717e4d083ea3d7..a27bf00da157687dddda3c9262af400bcc411acc 100644
--- a/src/uncategorized/BackwardsCompatibility.tw
+++ b/src/uncategorized/BackwardsCompatibility.tw
@@ -2964,6 +2964,14 @@ Setting missing slave variables:
 	<<set _Slave.pregSource = 0>>
 <</if>>
 
+<<if ndef _Slave.superfetation>>
+	<<set _Slave.superfetation = 0>>
+<</if>>
+
+<<if ndef _Slave.ovaImplant>>
+	<<set _Slave.ovaImplant = 0>>
+<</if>>
+
 <<if ndef _Slave.training>>
 	<<set _Slave.training = 0>>
 <</if>>