diff --git a/src/analytics/ga4.ts b/src/analytics/ga4.ts
index a106482..b65aa88 100644
--- a/src/analytics/ga4.ts
+++ b/src/analytics/ga4.ts
@@ -84,8 +84,11 @@ export function initGoogleAnalytics(): void {
   if (!id || (!isGA4ProductionHost(host) && !isGA4DebugHost(host))) return;
   try {
     window.dataLayer = window.dataLayer || [];
-    window.gtag = function gtagShim(...args: unknown[]) {
-      window.dataLayer!.push(args);
+    // MUST push `arguments`, not a rest-args array — gtag.js's command
+    // interpreter only processes Arguments objects in dataLayer; plain
+    // arrays are ignored (container registers but no hits ever flush).
+    window.gtag = function gtagShim() {
+      window.dataLayer!.push(arguments);
     };
     window.gtag('js', new Date());
     window.gtag('config', id, {
diff --git a/test/ga4-analytics.test.mjs b/test/ga4-analytics.test.mjs
index 2e7f510..6966ea8 100644
--- a/test/ga4-analytics.test.mjs
+++ b/test/ga4-analytics.test.mjs
@@ -103,6 +103,14 @@ test('config disables automatic page_view and ads/identity features', () => {
   assert.match(facade, /debug_mode: isGA4DebugHost/, 'localhost must run debug_mode');
 });
 
+test('dataLayer shim pushes arguments — plain arrays are ignored by gtag.js', () => {
+  // gtag.js's command interpreter only processes Arguments objects; a
+  // (...args) => push(args) shim silently drops every command.
+  const facade = codeOnly('src/analytics/ga4.ts');
+  assert.match(facade, /push\(arguments\)/);
+  assert.doesNotMatch(facade, /push\(args\)/);
+});
+
 test('gtag script loads async from googletagmanager.com only', () => {
   const facade = src('src/analytics/ga4.ts');
   assert.match(facade, /script\.async\s*=\s*true/);