diff --git a/src/uncategorized/BackwardsCompatibility.tw b/src/uncategorized/BackwardsCompatibility.tw
index 7fd3cee4f3d83a6369a031827a15ea5f554a6e9c..93bf3e13a905a6254d47793a483e285410bba301 100644
--- a/src/uncategorized/BackwardsCompatibility.tw
+++ b/src/uncategorized/BackwardsCompatibility.tw
@@ -1590,6 +1590,9 @@ Setting missing global variables:
 <<if ndef $REReductionCheckinIDs>>
 	<<set $REReductionCheckinIDs = []>>
 <</if>>
+<<if def $RERelationshipSlave>>
+	<<unset $RERelationshipSlave>>
+<</if>>
 <<if ndef $dormitory>>
 	<<set $dormitory = 20>>
 <</if>>