diff --git a/src/cheats/mod_EditSlaveCheatDatatypeCleanupNew.tw b/src/cheats/mod_EditSlaveCheatDatatypeCleanupNew.tw
index 45318642df5ba63c2c4e1b787cd830ee0e5347e7..7409ad81f305f630771336f4c8f5ab7098666152 100644
--- a/src/cheats/mod_EditSlaveCheatDatatypeCleanupNew.tw
+++ b/src/cheats/mod_EditSlaveCheatDatatypeCleanupNew.tw
@@ -67,6 +67,9 @@
 <<set $tempSlave.preg = Number($tempSlave.preg) || 0>>
 <<set $tempSlave.pregType = Number($tempSlave.pregType) || 0>>
 <<set $tempSlave.pregSource = Number($tempSlave.pregSource) || 0>>
+<<if $tempSlave.preg < 0>>
+    <<set $tempSlave.pregKnown = 0>>
+<</if>>
 <<set $tempSlave.dick = Number($tempSlave.dick) || 0>>
 <<set $tempSlave.clit = Number($tempSlave.clit) || 0>>
 <<set $tempSlave.labia = Number($tempSlave.labia) || 0>>