diff --git a/packages/metro-bundler/src/Bundler/Bundle.js b/packages/metro-bundler/src/Bundler/Bundle.js
index 06400343..002c816e 100644
--- a/packages/metro-bundler/src/Bundler/Bundle.js
+++ b/packages/metro-bundler/src/Bundler/Bundle.js
@@ -88,7 +88,11 @@ class Bundle extends BundleBase {
      */
     resolver: {
       wrapModule: (options: any) => {code: any, map: any},
-      minifyModule: ({code: any, map: any, path: any}) => Promise<{
+      minifyModule: (
+        code: any,
+        map: any,
+        path: any,
+      ) => Promise<{
         code: any,
         map: any,
       }>,
diff --git a/packages/metro-bundler/src/Bundler/index.js b/packages/metro-bundler/src/Bundler/index.js
index cb61ee84..09209cd7 100644
--- a/packages/metro-bundler/src/Bundler/index.js
+++ b/packages/metro-bundler/src/Bundler/index.js
@@ -224,7 +224,7 @@ class Bundler {
       globalTransformCache: opts.globalTransformCache,
       hasteImpl: opts.hasteImpl,
       maxWorkers: opts.maxWorkers,
-      minifyCode: this._transformer.minify,
+      minifyCode: this._transformer.minify.bind(this._transformer),
       postMinifyProcess: this._opts.postMinifyProcess,
       platforms: new Set(opts.platforms),
       polyfillModuleNames: opts.polyfillModuleNames,
diff --git a/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js b/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
index 54822342..e5d8ce36 100644
--- a/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
+++ b/packages/metro-bundler/src/DeltaBundler/DeltaTransformer.js
@@ -15,7 +15,6 @@
 const DeltaCalculator = require('./DeltaCalculator');
 
 const createModuleIdFactory = require('../lib/createModuleIdFactory');
-const minify = require('../JSTransformer/worker/minify');
 
 const {EventEmitter} = require('events');
 
@@ -448,7 +447,11 @@ class DeltaTransformer extends EventEmitter {
         };
 
     const {code, map} = transformOptions.minify
-      ? minify.withRawMappings(wrapped.code, wrapped.map, module.path)
+      ? await this._resolver.minifyModule(
+          module.path,
+          wrapped.code,
+          wrapped.map,
+        )
       : wrapped;
 
     const id = this._getModuleId(module);
diff --git a/packages/metro-bundler/src/Resolver/__tests__/Resolver-test.js b/packages/metro-bundler/src/Resolver/__tests__/Resolver-test.js
index 539db0d7..e3624716 100644
--- a/packages/metro-bundler/src/Resolver/__tests__/Resolver-test.js
+++ b/packages/metro-bundler/src/Resolver/__tests__/Resolver-test.js
@@ -406,7 +406,7 @@ describe('Resolver', function() {
           dependencies: [module],
           mainModuleId: id,
         });
-        sourceMap = {version: 3, sources: ['input'], mappings: 'whatever'};
+        sourceMap = [];
         return Resolver.load({
           projectRoot: '/root',
           minifyCode,
@@ -419,19 +419,20 @@ describe('Resolver', function() {
       it('should use minified code', () => {
         expect.assertions(2);
         const minifiedCode = 'minified(code)';
-        const minifiedMap = {version: 3, file: ['minified']};
+        const minifiedMap = {
+          version: 3,
+          file: ['minified'],
+          sources: [],
+          mappings: '',
+        };
         minifyCode.mockReturnValue(
           Promise.resolve({code: minifiedCode, map: minifiedMap}),
         );
         return depResolver
-          .minifyModule({
-            path: module.path,
-            name: id,
-            code,
-          })
+          .minifyModule(module.path, code, sourceMap)
           .then(({code, map}) => {
             expect(code).toEqual(minifiedCode);
-            expect(map).toEqual(minifiedMap);
+            expect(map).toEqual([]);
           });
       });
     });
diff --git a/packages/metro-bundler/src/Resolver/index.js b/packages/metro-bundler/src/Resolver/index.js
index 038cf149..5b1edd69 100644
--- a/packages/metro-bundler/src/Resolver/index.js
+++ b/packages/metro-bundler/src/Resolver/index.js
@@ -15,6 +15,12 @@
 const DependencyGraph = require('../node-haste/DependencyGraph');
 
 const defaults = require('../defaults');
+
+const {
+  compactMapping,
+  fromRawMappings,
+  toRawMappings,
+} = require('../Bundler/source-map');
 const pathJoin = require('path').join;
 
 import type ResolutionResponse from '../node-haste/DependencyGraph/ResolutionResponse';
@@ -256,17 +262,23 @@ class Resolver {
     return {code, map};
   }
 
-  async minifyModule({
-    path,
-    code,
-    map,
-  }: {
+  async minifyModule(
     path: string,
     code: string,
-    map: ?MappingsMap,
-  }): Promise<{code: string, map: ?MappingsMap}> {
-    const minified = await this._minifyCode(path, code, map);
-    return await this._postMinifyProcess(minified);
+    map: CompactRawMappings,
+  ): Promise<{code: string, map: CompactRawMappings}> {
+    const sourceMap = fromRawMappings([{code, source: code, map, path}]).toMap(
+      undefined,
+      {},
+    );
+
+    const minified = await this._minifyCode(path, code, sourceMap);
+    const result = await this._postMinifyProcess(minified);
+
+    return {
+      code: result.code,
+      map: result.map ? toRawMappings(result.map).map(compactMapping) : [],
+    };
   }
 
   getDependencyGraph(): DependencyGraph {