diff --git a/src/js/internal/promisify.ts b/src/js/internal/promisify.ts
new file mode 100644
index 0000000000..76a6ecefc6
--- /dev/null
+++ b/src/js/internal/promisify.ts
@@ -0,0 +1,79 @@
+const kCustomPromisifiedSymbol = Symbol.for("nodejs.util.promisify.custom");
+const kCustomPromisifyArgsSymbol = Symbol("customPromisifyArgs");
+
+function defineCustomPromisify(target, callback) {
+  Object.defineProperty(target, kCustomPromisifiedSymbol, {
+    value: callback,
+    __proto__: null,
+    configurable: true,
+  });
+
+  return callback;
+}
+
+function defineCustomPromisifyArgs(target, args) {
+  Object.defineProperty(target, kCustomPromisifyArgsSymbol, {
+    __proto__: null,
+    value: args,
+    enumerable: false,
+  });
+  return args;
+}
+
+var promisify = function promisify(original) {
+  if (typeof original !== "function") throw new TypeError('The "original" argument must be of type Function');
+  const custom = original[kCustomPromisifiedSymbol];
+  if (custom) {
+    if (typeof custom !== "function") {
+      throw new TypeError('The "util.promisify.custom" argument must be of type Function');
+    }
+    // ensure that we don't create another promisified function wrapper
+    return defineCustomPromisify(custom, custom);
+  }
+
+  const callbackArgs = original[kCustomPromisifyArgsSymbol];
+
+  function fn(...originalArgs) {
+    const { promise, resolve, reject } = Promise.withResolvers();
+    try {
+      original.$apply(this, [
+        ...originalArgs,
+        function (err, ...values) {
+          if (err) {
+            return reject(err);
+          }
+
+          if (callbackArgs !== undefined && values.length > 0) {
+            if (!Array.isArray(callbackArgs)) {
+              throw new TypeError('The "customPromisifyArgs" argument must be of type Array');
+            }
+            if (callbackArgs.length !== values.length) {
+              throw new Error("Mismatched length in promisify callback args");
+            }
+            const result = {};
+            for (let i = 0; i < callbackArgs.length; i++) {
+              result[callbackArgs[i]] = values[i];
+            }
+            resolve(result);
+          } else {
+            resolve(values[0]);
+          }
+        },
+      ]);
+    } catch (err) {
+      reject(err);
+    }
+
+    return promise;
+  }
+  Object.setPrototypeOf(fn, Object.getPrototypeOf(original));
+  defineCustomPromisify(fn, fn);
+  return Object.defineProperties(fn, Object.getOwnPropertyDescriptors(original));
+};
+promisify.custom = kCustomPromisifiedSymbol;
+
+export default {
+  defineCustomPromisify,
+  defineCustomPromisifyArgs,
+  promisify,
+};
diff --git a/src/js/node/crypto.ts b/src/js/node/crypto.ts
index 8a38faef89..8727f9a901 100644
--- a/src/js/node/crypto.ts
+++ b/src/js/node/crypto.ts
@@ -11935,14 +11935,17 @@ function _generateKeyPairSync(algorithm, options) {
 }
 crypto_exports.generateKeyPairSync = _generateKeyPairSync;
 
-crypto_exports.generateKeyPair = function (algorithm, options, callback) {
+function _generateKeyPair(algorithm, options, callback) {
   try {
     const result = _generateKeyPairSync(algorithm, options);
     typeof callback === "function" && callback(null, result.publicKey, result.privateKey);
   } catch (err) {
     typeof callback === "function" && callback(err);
   }
-};
+}
+const { defineCustomPromisifyArgs } = require("internal/promisify");
+defineCustomPromisifyArgs(_generateKeyPair, ["publicKey", "privateKey"]);
+crypto_exports.generateKeyPair = _generateKeyPair;
 
 crypto_exports.createSecretKey = function (key, encoding) {
   if (key instanceof KeyObject || key instanceof CryptoKey) {
diff --git a/src/js/node/timers.ts b/src/js/node/timers.ts
index 6150ce4579..7bbe39b921 100644
--- a/src/js/node/timers.ts
+++ b/src/js/node/timers.ts
@@ -1,4 +1,32 @@
 // Hardcoded module "node:timers"
+const { defineCustomPromisify } = require("internal/promisify");
+
+// Lazily load node:timers/promises promisified functions onto the global timers.
+{
+  const { setTimeout: timeout, setImmediate: immediate, setInterval: interval } = globalThis;
+
+  if (timeout && $isCallable(timeout)) {
+    defineCustomPromisify(timeout, function setTimeout(arg1) {
+      const fn = defineCustomPromisify(timeout, require("node:timers/promises").setTimeout);
+      return fn.$apply(this, arguments);
+    });
+  }
+
+  if (immediate && $isCallable(immediate)) {
+    defineCustomPromisify(immediate, function setImmediate(arg1) {
+      const fn = defineCustomPromisify(immediate, require("node:timers/promises").setImmediate);
+      return fn.$apply(this, arguments);
+    });
+  }
+
+  if (interval && $isCallable(interval)) {
+    defineCustomPromisify(interval, function setInterval(arg1) {
+      const fn = defineCustomPromisify(interval, require("node:timers/promises").setInterval);
+      return fn.$apply(this, arguments);
+    });
+  }
+}
+
 export default {
   setTimeout,
   clearTimeout,
diff --git a/src/js/node/util.ts b/src/js/node/util.ts
index d6280be6fd..58fb2f9277 100644
--- a/src/js/node/util.ts
+++ b/src/js/node/util.ts
@@ -3,6 +3,7 @@ const types = require("node:util/types");
 /** @type {import('node-inspect-extracted')} */
 const utl = require("internal/util/inspect");
 const { ERR_INVALID_ARG_TYPE, ERR_OUT_OF_RANGE } = require("internal/errors");
+const { promisify } = require("internal/promisify");
 
 const internalErrorName = $newZigFunction("node_util_binding.zig", "internalErrorName", 1);
 
@@ -158,80 +159,7 @@ var _extend = function (origin, add) {
   }
   return origin;
 };
-var kCustomPromisifiedSymbol = Symbol.for("nodejs.util.promisify.custom");
-function defineCustomPromisify(target, callback) {
-  Object.defineProperty(target, kCustomPromisifiedSymbol, {
-    value: callback,
-    __proto__: null,
-    configurable: true,
-  });
 
-  return callback;
-}
-
-// Lazily load node:timers/promises promisifed functions onto the global timers.
-// This is not a complete solution, as one could load these without loading the "util" module
-// But it is better than nothing.
-{
-  const { setTimeout: timeout, setImmediate: immediate, setInterval: interval } = globalThis;
-
-  if (timeout && $isCallable(timeout)) {
-    defineCustomPromisify(timeout, function setTimeout(arg1) {
-      const fn = defineCustomPromisify(timeout, require("node:timers/promises").setTimeout);
-      return fn.$apply(this, arguments);
-    });
-  }
-
-  if (immediate && $isCallable(immediate)) {
-    defineCustomPromisify(immediate, function setImmediate(arg1) {
-      const fn = defineCustomPromisify(immediate, require("node:timers/promises").setImmediate);
-      return fn.$apply(this, arguments);
-    });
-  }
-
-  if (interval && $isCallable(interval)) {
-    defineCustomPromisify(interval, function setInterval(arg1) {
-      const fn = defineCustomPromisify(interval, require("node:timers/promises").setInterval);
-      return fn.$apply(this, arguments);
-    });
-  }
-}
-
-var promisify = function promisify(original) {
-  if (typeof original !== "function") throw new TypeError('The "original" argument must be of type Function');
-  const custom = original[kCustomPromisifiedSymbol];
-  if (custom) {
-    if (typeof custom !== "function") {
-      throw new TypeError('The "util.promisify.custom" argument must be of type Function');
-    }
-    // ensure that we don't create another promisified function wrapper
-    return defineCustomPromisify(custom, custom);
-  }
-
-  function fn(...originalArgs) {
-    const { promise, resolve, reject } = Promise.withResolvers();
-    try {
-      original.$apply(this, [
-        ...originalArgs,
-        function (err, ...values) {
-          if (err) {
-            return reject(err);
-          }
-
-          resolve(values[0]);
-        },
-      ]);
-    } catch (err) {
-      reject(err);
-    }
-
-    return promise;
-  }
-  Object.setPrototypeOf(fn, Object.getPrototypeOf(original));
-  defineCustomPromisify(fn, fn);
-  return Object.defineProperties(fn, getOwnPropertyDescriptors(original));
-};
-promisify.custom = kCustomPromisifiedSymbol;
 function callbackifyOnRejected(reason, cb) {
   if (!reason) {
     var newReason = new Error("Promise was rejected with a falsy value");
diff --git a/test/regression/issue/09469.test.ts b/test/regression/issue/09469.test.ts
new file mode 100644
index 0000000000..9d8db4304d
--- /dev/null
+++ b/test/regression/issue/09469.test.ts
@@ -0,0 +1,27 @@
+const crypto = require("crypto");
+const util = require("util");
+
+if (!crypto.generateKeyPair) {
+  test.skip("missing crypto.generateKeyPair");
+}
+
+test("09469", async () => {
+  const generateKeyPairAsync = util.promisify(crypto.generateKeyPair);
+  const ret = await generateKeyPairAsync("rsa", {
+    publicExponent: 3,
+    modulusLength: 512,
+    publicKeyEncoding: {
+      type: "pkcs1",
+      format: "pem",
+    },
+    privateKeyEncoding: {
+      type: "pkcs8",
+      format: "pem",
+    },
+  });
+
+  expect(Object.keys(ret)).toHaveLength(2);
+  const { publicKey, privateKey } = ret;
+  expect(typeof publicKey).toBe("string");
+  expect(typeof privateKey).toBe("string");
+});