diff --git a/src/npc/surgery/surgeryDegradation.js b/src/npc/surgery/surgeryDegradation.js
index da3f7a13fc09498e733bac4f83134db0a96ba599..342a9fc5d79436022b2aa09b5593f09de69cd399 100644
--- a/src/npc/surgery/surgeryDegradation.js
+++ b/src/npc/surgery/surgeryDegradation.js
@@ -6,8 +6,8 @@ App.UI.SlaveInteract.surgeryDegradation = function(slave) {
 		he, his, him, hers, himself, sister, wife, girl
 	} = getPronouns(slave);
 	const {heP} = getPronouns(V.PC).appendSuffix("P");
-	const boobFat = V.boobFat;
-	const buttFat = V.buttFat;
+	const boobFat = Math.max(V.boobFat, 0) || 0;
+	const buttFat = Math.max(V.buttFat, 0) || 0;
 	const pubertyAge = Math.min(slave.pubertyAgeXX, slave.pubertyAgeXY);
 	let hairChanges = 0;
 	let hair = '';