diff --git a/src/NetscriptJSEvaluator.js b/src/NetscriptJSEvaluator.js
index 65b714c06..d3241f557 100644
--- a/src/NetscriptJSEvaluator.js
+++ b/src/NetscriptJSEvaluator.js
@@ -74,7 +74,7 @@ function shouldCompile(script, scripts) {
         // compilation errors.
         if (!depScript) return true;
 
-        const depIsMoreRecent = depScript.updateTimestamp > script.updateTimestamp
+        const depIsMoreRecent = depScript.moduleSequenceNumber > script.moduleSequenceNumber
         return depIsMoreRecent;
     });
 }
diff --git a/src/Script/Script.ts b/src/Script/Script.ts
index dc8a69367..3b9df8135 100644
--- a/src/Script/Script.ts
+++ b/src/Script/Script.ts
@@ -15,6 +15,8 @@ import {
 } from "../../utils/JSONReviver";
 import { roundToTwo } from "../../utils/helpers/roundToTwo";
 
+let globalModuleSequenceNumber = 0;
+
 export class Script {
     // Initializes a Script Object from a JSON save state
     static fromJSON(value: any): Script {
@@ -32,7 +34,7 @@ export class Script {
     module: any = "";
 
     // The timestamp when when the script was last updated.
-    updateTimestamp: number = 0;
+    moduleSequenceNumber: number;
 
     // Only used with NS2 scripts; the list of dependency script filenames. This is constructed
     // whenever the script is first evaluated, and therefore may be out of date if the script
@@ -51,6 +53,7 @@ export class Script {
         this.ramUsage   = 0;
     	this.server 	= server; // IP of server this script is on
         this.module     = "";
+        this.moduleSequenceNumber = ++globalModuleSequenceNumber;
         if (this.code !== "") { this.updateRamUsage(otherScripts); }
     };
 
@@ -101,7 +104,7 @@ export class Script {
     // Marks that this script has been updated. Causes recompilation of NS2 modules.
     markUpdated() {
         this.module = "";
-        this.updateTimestamp = Date.now();
+        this.moduleSequenceNumber = ++globalModuleSequenceNumber;
     }
 
     /**