diff --git a/src/uncategorized/BackwardsCompatibility.tw b/src/uncategorized/BackwardsCompatibility.tw
index a65a21e7356716e24968399ceb0f054a073f2ddc..f73479dba5a183e2f3d0a9b3b3c9d431d5bae63c 100644
--- a/src/uncategorized/BackwardsCompatibility.tw
+++ b/src/uncategorized/BackwardsCompatibility.tw
@@ -3183,7 +3183,7 @@ Setting missing slave variables:
 	<<if _dontDeleteMe == 0>>
 		<<set $genePool.deleteAt(_bci), _bci-->>
 	<</if>>
-
+	<<set $genePool[_bci] = _Slave>>
 <</for>>
 
 <<if $incubator > 0>>