diff --git a/src/pregmod/saAgent.tw b/src/pregmod/saAgent.tw
index 1f8b5723f51ff8ef25a7778aaacfc4bec3616661..419c1b45af150e05101dba693f12b2e0044bdde8 100644
--- a/src/pregmod/saAgent.tw
+++ b/src/pregmod/saAgent.tw
@@ -148,7 +148,7 @@
 			<<set _babyDaddy = findFather($slaves[$i].pregSource)>>
 			<<if def _babyDaddy>>
 				<<set _adjust = _babyDaddy.counter.slavesKnockedUp++>>
-				<<set adjustFatherProperty(_babyDaddy, slavesKnockedUp, _adjust)>>
+				<<set adjustFatherProperty(_babyDaddy, "slavesKnockedUp", _adjust)>>
 			<</if>>
 		<</if>>
 	<</if>>