diff --git a/packages/csr/src/reactive-runtime.ts b/packages/csr/src/reactive-runtime.ts
index 0478bdb5..12e7a62a 100644
--- a/packages/csr/src/reactive-runtime.ts
+++ b/packages/csr/src/reactive-runtime.ts
@@ -4138,13 +4138,14 @@ export const REACTIVE_RUNTIME = String.raw`
   }
 
   function callServerFunction(component, functionName, args) {
-    var csrf = document.querySelector('meta[name="wrnexus-csrf"]');
+    var csrfMatch = /(?:^|;\s*)wire-csrf=([^;]+)/.exec(document.cookie || "");
+    var csrf = csrfMatch ? decodeURIComponent(csrfMatch[1]) : "";
     return fetch("/__wrnexus/rpc", {
       method: "POST",
       credentials: "same-origin",
       headers: {
         "content-type": "application/json",
-        "x-csrf-token": csrf ? csrf.getAttribute("content") || "" : "",
+        "x-csrf-token": csrf,
       },
       body: JSON.stringify({ component: component, function: functionName, args: args || [] }),
     }).then(function (response) {
diff --git a/packages/csr/test/reactive.test.ts b/packages/csr/test/reactive.test.ts
index 8c233bc9..e0fe8683 100644
--- a/packages/csr/test/reactive.test.ts
+++ b/packages/csr/test/reactive.test.ts
@@ -801,6 +801,33 @@ test("an unbound native-named output does not re-enter its DOM handler", () => {
   expect(outputs).toBe(1);
 });
 
+test("component server calls send the CSRF cookie in the RPC header", async () => {
+  const win = mount(
+    `<div data-scope="" data-wrn-component="Home">` +
+      `<button data-on-click="server.handleClick()">go</button>` +
+      `</div>`,
+  );
+  Object.defineProperty(win.document, "cookie", {
+    configurable: true,
+    value: "wire-csrf=rpc%20token",
+  });
+  let request: RequestInit | undefined;
+  const globals = globalThis as Record<string, unknown>;
+  const originalFetch = globals.fetch;
+  globals.fetch = async (_input: RequestInfo | URL, init?: RequestInit) => {
+    request = init;
+    return Response.json({ ok: true });
+  };
+  try {
+    (win.document.querySelector("button") as unknown as HTMLElement).click();
+    await new Promise((resolve) => setTimeout(resolve, 0));
+  } finally {
+    globals.fetch = originalFetch;
+  }
+
+  expect(new Headers(request?.headers).get("x-csrf-token")).toBe("rpc token");
+});
+
 test("development runtime warns when a component binding names a missing function", () => {
   const win = new Window() as unknown as Window & Record<string, unknown>;
   win.document.body.innerHTML =