diff --git a/src/pregmod/incubator.tw b/src/pregmod/incubator.tw
index c5efa54a29ed033b660ada6c47fac8dc5a839e6e..c6aadbc121e66ef3ef91097461c485cd084bb5ed 100644
--- a/src/pregmod/incubator.tw
+++ b/src/pregmod/incubator.tw
@@ -599,7 +599,7 @@ Target age for release: <<textbox "$targetAge" $targetAge "Incubator">> [[Minimu
 <<if _readySlaves == 1>>
 	<<if $incubatorBulkRelease == 1>>
 		<<set $newSlavePool = []>>
-		<<for _inc = 0; _inc < $incubatorSlaves; _inc++>>
+		<<for _inc = 0; _inc < $tanks.length; _inc++>>
 			<<if $tanks[_inc].growTime <= 0>>
 				<<set $incubatorOldID = $tanks[_inc].ID>> /* single slave case */
 				<<set _tempObject = {object: $tanks[_inc], ID: $tanks[_inc].ID}>>
@@ -609,7 +609,7 @@ Target age for release: <<textbox "$targetAge" $targetAge "Incubator">> [[Minimu
 			<</if>>
 		<</for>>
 		<<if $newSlavePool.length == 1>>
-			<<set $readySlave = $newSlavePool[0]>>
+			<<set $readySlave = $newSlavePool[0].object>>
 			<<set $newSlavePool = 0>>
 		<</if>>
 	<<else>>