diff --git a/src/specificClass.js b/src/specificClass.js
index c44aa43..5b87aef 100644
--- a/src/specificClass.js
+++ b/src/specificClass.js
@@ -121,9 +121,11 @@ class Settler {
 
   _connectMachine(machineChild) {
     if (machineChild.config.functionality.positionVsParent == "downstream") {
-      machineChild.upstreamReactor = this;
+      machineChild.upstreamSource = this;
       this.returnPump = machineChild;
+      return;
     }
+    this.logger.warn(`Failed to register machine child.`);
   }
 
   _updateMeasurement(measurementType, value, position, context) {