diff --git a/Libraries/Vibration/NativeVibration.js b/Libraries/Vibration/NativeVibration.js
index abdfa680c114cc..6de5352ec82f8e 100644
--- a/Libraries/Vibration/NativeVibration.js
+++ b/Libraries/Vibration/NativeVibration.js
@@ -15,7 +15,7 @@ import * as TurboModuleRegistry from '../TurboModule/TurboModuleRegistry';
 
 export interface Spec extends TurboModule {
   +getConstants: () => {||};
-  +vibrate: (pattern?: ?number) => void;
+  +vibrate: (pattern: number) => void;
 
   // Android only
   +vibrateByPattern: (pattern: Array<number>, repeat: number) => void;
diff --git a/Libraries/Vibration/RCTVibration.mm b/Libraries/Vibration/RCTVibration.mm
index a26424693d71a0..80925bf14ede63 100644
--- a/Libraries/Vibration/RCTVibration.mm
+++ b/Libraries/Vibration/RCTVibration.mm
@@ -25,7 +25,7 @@ - (void)vibrate
   AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);
 }
 
-RCT_EXPORT_METHOD(vibrate:(NSNumber *)pattern)
+RCT_EXPORT_METHOD(vibrate:(nonnull NSNumber *)pattern)
 {
   [self vibrate];
 }
diff --git a/Libraries/Vibration/Vibration.js b/Libraries/Vibration/Vibration.js
index 2f20cd7ae6061e..6165258ddfffa6 100644
--- a/Libraries/Vibration/Vibration.js
+++ b/Libraries/Vibration/Vibration.js
@@ -22,6 +22,7 @@ const Platform = require('../Utilities/Platform');
 
 let _vibrating: boolean = false;
 let _id: number = 0; // _id is necessary to prevent race condition.
+const _default_vibration_length = 400;
 
 function vibrateByPattern(pattern: Array<number>, repeat: boolean = false) {
   if (_vibrating) {
@@ -29,7 +30,7 @@ function vibrateByPattern(pattern: Array<number>, repeat: boolean = false) {
   }
   _vibrating = true;
   if (pattern[0] === 0) {
-    NativeVibration.vibrate();
+    NativeVibration.vibrate(_default_vibration_length);
     pattern = pattern.slice(1);
   }
   if (pattern.length === 0) {
@@ -48,7 +49,7 @@ function vibrateScheduler(
   if (!_vibrating || id !== _id) {
     return;
   }
-  NativeVibration.vibrate();
+  NativeVibration.vibrate(_default_vibration_length);
   if (nextIndex >= pattern.length) {
     if (repeat) {
       nextIndex = 0;
@@ -70,7 +71,7 @@ const Vibration = {
    * See https://facebook.github.io/react-native/docs/vibration.html#vibrate
    */
   vibrate: function(
-    pattern: number | Array<number> = 400,
+    pattern: number | Array<number> = _default_vibration_length,
     repeat: boolean = false,
   ) {
     if (Platform.OS === 'android') {
@@ -86,7 +87,7 @@ const Vibration = {
         return;
       }
       if (typeof pattern === 'number') {
-        NativeVibration.vibrate();
+        NativeVibration.vibrate(pattern);
       } else if (Array.isArray(pattern)) {
         vibrateByPattern(pattern, repeat);
       } else {
diff --git a/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeVibrationSpec.java b/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeVibrationSpec.java
index 4214a3c30fed47..f3f622dff63b4e 100644
--- a/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeVibrationSpec.java
+++ b/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeVibrationSpec.java
@@ -18,6 +18,7 @@
 import com.facebook.react.bridge.ReactModuleWithSpec;
 import com.facebook.react.bridge.ReadableArray;
 import com.facebook.react.turbomodule.core.interfaces.TurboModule;
+import javax.annotation.Nonnull;
 
 public abstract class NativeVibrationSpec extends ReactContextBaseJavaModule implements ReactModuleWithSpec, TurboModule {
   public NativeVibrationSpec(ReactApplicationContext reactContext) {
@@ -31,5 +32,5 @@ public NativeVibrationSpec(ReactApplicationContext reactContext) {
   public abstract void vibrateByPattern(ReadableArray pattern, double repeat);
 
   @ReactMethod
-  public abstract void vibrate(Double pattern);
+  public abstract void vibrate(@Nonnull Double pattern);
 }
diff --git a/ReactAndroid/src/main/java/com/facebook/react/modules/vibration/VibrationModule.java b/ReactAndroid/src/main/java/com/facebook/react/modules/vibration/VibrationModule.java
index 5e594ba9bd4619..e8601d694590c9 100644
--- a/ReactAndroid/src/main/java/com/facebook/react/modules/vibration/VibrationModule.java
+++ b/ReactAndroid/src/main/java/com/facebook/react/modules/vibration/VibrationModule.java
@@ -8,6 +8,7 @@
 package com.facebook.react.modules.vibration;
 
 import android.annotation.SuppressLint;
+import androidx.annotation.NonNull;
 import android.content.Context;
 import android.os.Vibrator;
 import com.facebook.fbreact.specs.NativeVibrationSpec;
@@ -31,7 +32,7 @@ public String getName() {
   }
 
   @Override
-  public void vibrate(Double durationDouble) {
+  public void vibrate(@NonNull Double durationDouble) {
     int duration = (int) durationDouble.doubleValue();
 
     Vibrator v = (Vibrator) getReactApplicationContext().getSystemService(Context.VIBRATOR_SERVICE);