diff --git a/src/bun.js/bindings/ZigGlobalObject.cpp b/src/bun.js/bindings/ZigGlobalObject.cpp
index 6398fb7a09c0e..a75c3f821f316 100644
--- a/src/bun.js/bindings/ZigGlobalObject.cpp
+++ b/src/bun.js/bindings/ZigGlobalObject.cpp
@@ -3075,11 +3075,21 @@ void GlobalObject::finishCreation(VM& vm)
             JSC::Identifier userAgentIdentifier = JSC::Identifier::fromString(init.vm, "userAgent"_s);
             JSC::Identifier hardwareConcurrencyIdentifier = JSC::Identifier::fromString(init.vm, "hardwareConcurrency"_s);
 
-            JSC::JSObject* obj = JSC::constructEmptyObject(init.owner, init.owner->objectPrototype(), 3);
+            JSC::JSObject* obj = JSC::constructEmptyObject(init.owner, init.owner->objectPrototype(), 4);
             obj->putDirect(init.vm, userAgentIdentifier, JSC::jsString(init.vm, str));
             obj->putDirect(init.vm, init.vm.propertyNames->toStringTagSymbol,
                 jsNontrivialString(init.vm, "Navigator"_s), JSC::PropertyAttribute::DontEnum | JSC::PropertyAttribute::ReadOnly);
 
+// https://developer.mozilla.org/en-US/docs/Web/API/Navigator/platform
+// https://github.com/oven-sh/bun/issues/4588
+#if OS(DARWIN)
+            obj->putDirect(init.vm, JSC::Identifier::fromString(init.vm, "platform"_s), JSC::jsString(init.vm, "MacIntel"_s));
+#elif OS(WINDOWS)
+            obj->putDirect(init.vm, JSC::Identifier::fromString(init.vm, "platform"_s), JSC::jsString(init.vm, "Win32"_s));
+#else if OS(LINUX)
+            obj->putDirect(init.vm, JSC::Identifier::fromString(init.vm, "platform"_s), JSC::jsString(init.vm, "Linux x86_64"_s));
+#endif
+
             obj->putDirect(init.vm, hardwareConcurrencyIdentifier, JSC::jsNumber(cpuCount));
             init.set(
                 obj);
diff --git a/test/js/web/web-globals.test.js b/test/js/web/web-globals.test.js
index 9b4c860067a66..5e666f2087fbb 100644
--- a/test/js/web/web-globals.test.js
+++ b/test/js/web/web-globals.test.js
@@ -224,4 +224,11 @@ test("navigator", () => {
   const userAgent = `Bun/${version}`;
   expect(navigator.hardwareConcurrency > 0).toBe(true);
   expect(navigator.userAgent).toBe(userAgent);
+  if (process.platform === "darwin") {
+    expect(navigator.platform).toBe("MacIntel");
+  } else if (process.platform === "win32") {
+    expect(navigator.platform).toBe("Win32");
+  } else if (process.platform === "linux") {
+    expect(navigator.platform).toBe("Linux");
+  }
 });