diff --git a/alg/pre.wx.js b/alg/pre.wx.js
index edc8bd6..0a381f0 100644
--- a/alg/pre.wx.js
+++ b/alg/pre.wx.js
@@ -5,19 +5,44 @@ WebAssembly.RuntimeErrror = Error;
 var performance = {
   now: Date.now,
 };
-Module['instantiateWasm'] = (info, receiveInstance) => {
-  console.log("loading wasm...", info);
 
-  // Use global wasmFilePath (should always be set by the main app)
-  var wasmPath = global.wasmFilePath;
-  if (!wasmPath) {
-    throw new Error("wasmFilePath must be provided via global.wasmFilePath");
+// Local variable to store WASM path
+var wasmFilePath = null;
+
+// Store instantiateWasm parameters for later use
+var pendingInstantiation = null;
+
+// Exported function to set WASM path
+Module['setWasmPath'] = (path) => {
+  console.log("Setting WASM path:", path);
+  wasmFilePath = path;
+
+  // If instantiateWasm was called before the path was set, call it now
+  if (pendingInstantiation) {
+    var {info, receiveInstance} = pendingInstantiation;
+    pendingInstantiation = null;
+    doInstantiateWasm(info, receiveInstance);
   }
-  console.log("Using WASM path:", wasmPath);
+};
 
-  WebAssembly.instantiate(wasmPath, info).then((result) => {
+function doInstantiateWasm(info, receiveInstance) {
+  console.log("loading wasm...", info);
+  console.log("Using WASM path:", wasmFilePath);
+
+  WebAssembly.instantiate(wasmFilePath, info).then((result) => {
     console.log("result:", result);
     var inst = result['instance'];
     receiveInstance(inst);
   });
 }
+
+Module['instantiateWasm'] = (info, receiveInstance) => {
+  // If WASM path is already set, proceed immediately
+  if (wasmFilePath) {
+    doInstantiateWasm(info, receiveInstance);
+  } else {
+    // Otherwise, store parameters for later use
+    console.log("WASM path not set yet, deferring instantiation...");
+    pendingInstantiation = {info, receiveInstance};
+  }
+}
diff --git a/scanner/pages/emblemscanner/qrprocessor.js b/scanner/pages/emblemscanner/qrprocessor.js
index 9ce736e..e936565 100644
--- a/scanner/pages/emblemscanner/qrprocessor.js
+++ b/scanner/pages/emblemscanner/qrprocessor.js
@@ -8,12 +8,12 @@ var qrtool_ready = false;
  * Load qrtool WASM module
  */
 function load_qrtool(wasmFilePath) {
-  // Set global WASM file path before loading the module
-  global.wasmFilePath = wasmFilePath;
-
-  // Load the WASM module
+  // Load the WASM module first
   var m = require('./qrtool.wx.js');
 
+  // Set WASM file path after loading the module (required parameter)
+  m['setWasmPath'](wasmFilePath);
+
   m.onRuntimeInitialized = () => {
     qrtool_ready = true;
     qrtool = m;
diff --git a/scanner/pages/emblemscanner/qrtool.wx.js b/scanner/pages/emblemscanner/qrtool.wx.js
index 2f5ae1c..b668186 100644
--- a/scanner/pages/emblemscanner/qrtool.wx.js
+++ b/scanner/pages/emblemscanner/qrtool.wx.js
@@ -32,19 +32,48 @@ WebAssembly.RuntimeErrror = Error;
 var performance = {
   now: Date.now
 };
-Module["instantiateWasm"] = (info, receiveInstance) => {
-  console.log("loading wasm...", info);
-  // Use global wasmFilePath (should always be set by the main app)
-  var wasmPath = global.wasmFilePath;
-  if (!wasmPath) {
-    throw new Error("wasmFilePath must be provided via global.wasmFilePath");
+
+// Local variable to store WASM path
+var wasmFilePath = null;
+
+// Store instantiateWasm parameters for later use
+var pendingInstantiation = null;
+
+// Exported function to set WASM path
+Module["setWasmPath"] = path => {
+  console.log("Setting WASM path:", path);
+  wasmFilePath = path;
+  // If instantiateWasm was called before the path was set, call it now
+  if (pendingInstantiation) {
+    var {
+      info,
+      receiveInstance
+    } = pendingInstantiation;
+    pendingInstantiation = null;
+    doInstantiateWasm(info, receiveInstance);
   }
-  console.log("Using WASM path:", wasmPath);
-  WebAssembly.instantiate(wasmPath, info).then(result => {
+};
+function doInstantiateWasm(info, receiveInstance) {
+  console.log("loading wasm...", info);
+  console.log("Using WASM path:", wasmFilePath);
+  WebAssembly.instantiate(wasmFilePath, info).then(result => {
     console.log("result:", result);
     var inst = result["instance"];
     receiveInstance(inst);
   });
+}
+Module["instantiateWasm"] = (info, receiveInstance) => {
+  // If WASM path is already set, proceed immediately
+  if (wasmFilePath) {
+    doInstantiateWasm(info, receiveInstance);
+  } else {
+    // Otherwise, store parameters for later use
+    console.log("WASM path not set yet, deferring instantiation...");
+    pendingInstantiation = {
+      info,
+      receiveInstance
+    };
+  }
 };
 
 // end include: /Users/fam/src/themblem/alg/pre.wx.js
diff --git a/scanner/pages/emblemscanner/worker/index.js b/scanner/pages/emblemscanner/worker/index.js
index 7b883b8..3b11cc0 100644
--- a/scanner/pages/emblemscanner/worker/index.js
+++ b/scanner/pages/emblemscanner/worker/index.js
@@ -1,12 +1,11 @@
 console.log("hello from emblemscanner worker");
 
-// Set global WASM file path before loading qrtool
+// Load qrtool module first, then set WASM path
 // The wasmFilePath will be passed from the main thread when the worker is created
+let qrtool = require('./qrtool.wx.js');
+
 if (typeof worker !== "undefined" && worker.wasmFilePath) {
-  global.wasmFilePath = worker.wasmFilePath;
-  let qrtool = require('./qrtool.wx.js');
-} else {
-  let qrtool = require('./qrtool.wx.js');
+  qrtool['setWasmPath'](worker.wasmFilePath);
 }
 
 
diff --git a/scanner/pages/emblemscanner/worker/qrtool.wx.js b/scanner/pages/emblemscanner/worker/qrtool.wx.js
index 2f5ae1c..b668186 100644
--- a/scanner/pages/emblemscanner/worker/qrtool.wx.js
+++ b/scanner/pages/emblemscanner/worker/qrtool.wx.js
@@ -32,19 +32,48 @@ WebAssembly.RuntimeErrror = Error;
 var performance = {
   now: Date.now
 };
-Module["instantiateWasm"] = (info, receiveInstance) => {
-  console.log("loading wasm...", info);
-  // Use global wasmFilePath (should always be set by the main app)
-  var wasmPath = global.wasmFilePath;
-  if (!wasmPath) {
-    throw new Error("wasmFilePath must be provided via global.wasmFilePath");
+
+// Local variable to store WASM path
+var wasmFilePath = null;
+
+// Store instantiateWasm parameters for later use
+var pendingInstantiation = null;
+
+// Exported function to set WASM path
+Module["setWasmPath"] = path => {
+  console.log("Setting WASM path:", path);
+  wasmFilePath = path;
+  // If instantiateWasm was called before the path was set, call it now
+  if (pendingInstantiation) {
+    var {
+      info,
+      receiveInstance
+    } = pendingInstantiation;
+    pendingInstantiation = null;
+    doInstantiateWasm(info, receiveInstance);
   }
-  console.log("Using WASM path:", wasmPath);
-  WebAssembly.instantiate(wasmPath, info).then(result => {
+};
+function doInstantiateWasm(info, receiveInstance) {
+  console.log("loading wasm...", info);
+  console.log("Using WASM path:", wasmFilePath);
+  WebAssembly.instantiate(wasmFilePath, info).then(result => {
     console.log("result:", result);
     var inst = result["instance"];
     receiveInstance(inst);
   });
+}
+Module["instantiateWasm"] = (info, receiveInstance) => {
+  // If WASM path is already set, proceed immediately
+  if (wasmFilePath) {
+    doInstantiateWasm(info, receiveInstance);
+  } else {
+    // Otherwise, store parameters for later use
+    console.log("WASM path not set yet, deferring instantiation...");
+    pendingInstantiation = {
+      info,
+      receiveInstance
+    };
+  }
 };
 
 // end include: /Users/fam/src/themblem/alg/pre.wx.js
diff --git a/scanner/precheck.js b/scanner/precheck.js
index 8616270..3e3a80d 100644
--- a/scanner/precheck.js
+++ b/scanner/precheck.js
@@ -3,6 +3,8 @@ var qrtool_ready = false;
 
 function load_qrtool() {
   var m = require('/assets/qrtool.wx.js');
+  // Set WASM file path for web context
+  m['setWasmPath']('/assets/qrtool.wx.wasm');
   m.onRuntimeInitialized = () => {
     console.log("runtime initialized");
     qrtool_ready = true;