diff --git a/src/js/wombJS.js b/src/js/wombJS.js
index b6f5c87d1d19088121fdf0ac38450ae3ae83214b..1a1f8a0fd7ff3c0a20e75e01eb9b118ea4aad148 100644
--- a/src/js/wombJS.js
+++ b/src/js/wombJS.js
@@ -61,7 +61,7 @@ globalThis.WombInit = function(actor) {
 				ft.reserve = "";
 			}
 			if (typeof ft.motherID !== 'number') { // setting missing biological mother ID for fetus.
-				ft.motherID = slave.ID;
+				ft.motherID = actor.ID;
 			}
 			if (ft.ID === undefined) {
 				ft.ID = generateNewID();