diff --git a/types/node/crypto.d.ts b/types/node/crypto.d.ts
index d17c6f6dc2..481e991421 100644
--- a/types/node/crypto.d.ts
+++ b/types/node/crypto.d.ts
@@ -423,8 +423,8 @@ declare module "crypto" {
 
     interface BasePrivateKeyEncodingOptions<T extends KeyFormat> {
         format: T;
-        cipher: string;
-        passphrase: string;
+        cipher?: string;
+        passphrase?: string;
     }
 
     interface KeyPairKeyObjectResult {
diff --git a/types/node/test/crypto.ts b/types/node/test/crypto.ts
index 4680682b06..39c639482c 100644
--- a/types/node/test/crypto.ts
+++ b/types/node/test/crypto.ts
@@ -337,6 +337,21 @@ import { promisify } from 'util';
         },
     });
 
+    const rsaResNoPassphrase: {
+        publicKey: Buffer;
+        privateKey: string;
+    } = crypto.generateKeyPairSync('rsa', {
+        modulusLength: 123,
+        publicKeyEncoding: {
+            format: 'der',
+            type: 'pkcs1',
+        },
+        privateKeyEncoding: {
+            format: 'pem',
+            type: 'pkcs8',
+        },
+    });
+
     const dsaRes: {
         publicKey: string;
         privateKey: Buffer;
@@ -355,6 +370,22 @@ import { promisify } from 'util';
         },
     });
 
+    const dsaResNoPassphrase: {
+        publicKey: string;
+        privateKey: Buffer;
+    } = crypto.generateKeyPairSync('dsa', {
+        modulusLength: 123,
+        divisorLength: 123,
+        publicKeyEncoding: {
+            format: 'pem',
+            type: 'spki',
+        },
+        privateKeyEncoding: {
+            format: 'der',
+            type: 'pkcs8',
+        },
+    });
+
     const ecRes: {
         publicKey: string;
         privateKey: string;
@@ -371,6 +402,21 @@ import { promisify } from 'util';
             type: 'pkcs8',
         },
     });
+
+    const ecResNoPassphrase: {
+        publicKey: string;
+        privateKey: string;
+    } = crypto.generateKeyPairSync('ec', {
+        namedCurve: 'curve',
+        publicKeyEncoding: {
+            format: 'pem',
+            type: 'pkcs1',
+        },
+        privateKeyEncoding: {
+            format: 'pem',
+            type: 'pkcs8',
+        },
+    });
 }
 
 {