diff --git a/src/auth-action-browser.ts b/src/auth-action-browser.ts
new file mode 100644
index 0000000..ffda54c
--- /dev/null
+++ b/src/auth-action-browser.ts
@@ -0,0 +1,5 @@
+export function createActionAuth() {
+  throw new Error(
+    "[@octokit/auth] `createActionAuth` is not supported in browsers"
+  );
+}