diff --git a/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js b/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
index cce7ff8a..ac660b5e 100644
--- a/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
+++ b/packages/metro-bundler/src/ModuleGraph/ModuleGraph.js
@@ -97,6 +97,6 @@ function* concat<T>(...iterables: Array<Iterable<T>>): Iterable<T> {
 function prelude(optimize) {
   return virtualModule(
     `var __DEV__=${String(!optimize)},` +
-    '__BUNDLE_START_TIME__=global.nativePerformanceNow?global.nativePerformanceNow():Date.now();'
+    '__BUNDLE_START_TIME__=this.nativePerformanceNow?nativePerformanceNow():Date.now();'
   );
 }
diff --git a/packages/metro-bundler/src/ModuleGraph/__tests__/ModuleGraph-test.js b/packages/metro-bundler/src/ModuleGraph/__tests__/ModuleGraph-test.js
index d9a9108a..bc91a412 100644
--- a/packages/metro-bundler/src/ModuleGraph/__tests__/ModuleGraph-test.js
+++ b/packages/metro-bundler/src/ModuleGraph/__tests__/ModuleGraph-test.js
@@ -29,7 +29,7 @@ describe('build setup', () => {
         dependencies: [],
         file: {
           code: 'var __DEV__=true,__BUNDLE_START_TIME__=' +
-            'global.nativePerformanceNow?global.nativePerformanceNow():Date.now();',
+            'this.nativePerformanceNow?nativePerformanceNow():Date.now();',
           path: '',
           type: 'script',
         },
@@ -43,7 +43,7 @@ describe('build setup', () => {
       const [prelude] = result.modules;
       expect(prelude.file.code)
         .toEqual('var __DEV__=false,__BUNDLE_START_TIME__=' +
-            'global.nativePerformanceNow?global.nativePerformanceNow():Date.now();');
+            'this.nativePerformanceNow?nativePerformanceNow():Date.now();');
       done();
     });
   });