diff --git a/packages/metro/src/DeltaBundler/Serializers/Serializers.js b/packages/metro/src/DeltaBundler/Serializers/Serializers.js
index 67605224..5534ed77 100644
--- a/packages/metro/src/DeltaBundler/Serializers/Serializers.js
+++ b/packages/metro/src/DeltaBundler/Serializers/Serializers.js
@@ -135,10 +135,7 @@ async function _getAllModules(
   lastModified: Date,
   deltaTransformer: DeltaTransformer,
 }> {
-  const hashedOptions = options;
-  delete hashedOptions.sourceMapUrl;
-
-  const clientId = '__SERVER__' + stableHash(hashedOptions).toString('hex');
+  const clientId = '__SERVER__' + stableHash(options).toString('hex');
 
   const deltaPatcher = DeltaPatcher.get(clientId);
 
diff --git a/packages/metro/src/DeltaBundler/__tests__/Serializers-test.js b/packages/metro/src/DeltaBundler/__tests__/Serializers-test.js
index 327895f4..b212bcbc 100644
--- a/packages/metro/src/DeltaBundler/__tests__/Serializers-test.js
+++ b/packages/metro/src/DeltaBundler/__tests__/Serializers-test.js
@@ -50,12 +50,12 @@ describe('Serializers', () => {
     postProcessModules.mockImplementation(modules => modules);
 
     deltaBundler = {
-      async getDeltaTransformer() {
-        return {
+      getDeltaTransformer: jest.fn().mockReturnValue(
+        Promise.resolve({
           getDelta,
           getDependenciesFn,
-        };
-      },
+        }),
+      ),
       getPostProcessModulesFn() {
         return postProcessModules;
       },
@@ -101,7 +101,11 @@ describe('Serializers', () => {
   });
 
   it('should build the full JS bundle', async () => {
-    expect(await Serializers.fullBundle(deltaBundler, {})).toMatchSnapshot();
+    expect(
+      await Serializers.fullBundle(deltaBundler, {
+        sourceMapUrl: 'http://localhost:8081/myBundle.js',
+      }),
+    ).toMatchSnapshot();
 
     getDelta.mockReturnValueOnce(
       Promise.resolve({
@@ -121,6 +125,17 @@ describe('Serializers', () => {
     ).toMatchSnapshot();
   });
 
+  it('should pass the sourcemapURL param to the transformer', async () => {
+    await Serializers.fullBundle(deltaBundler, {
+      sourceMapUrl: 'http://localhost:8081/myBundle.js',
+    });
+
+    expect(deltaBundler.getDeltaTransformer.mock.calls[0][1]).toEqual({
+      deltaBundleId: '1234',
+      sourceMapUrl: 'http://localhost:8081/myBundle.js',
+    });
+  });
+
   // This test actually does not test the sourcemaps generation logic, which
   // is already tested in the source-map file.
   it('should build the full Source Maps', async () => {