diff --git a/aio/tools/ng-packages-installer/index.js b/aio/tools/ng-packages-installer/index.js
index f1dc7feffd..d8b6fd0670 100644
--- a/aio/tools/ng-packages-installer/index.js
+++ b/aio/tools/ng-packages-installer/index.js
@@ -165,6 +165,12 @@ class NgPackagesInstaller {
           .forEach(key => peerDependencies[key] = sourcePackagePeerDeps[key]);
       }
     });
+
+    // FIXME: Temporarily use RxJS from root `node_modules/`.
+    if (peerDependencies.rxjs) {
+      peerDependencies.rxjs = `file:${ANGULAR_ROOT_DIR}/node_modules/rxjs`;
+    }
+
     return [mergedDependencies, peerDependencies];
   }
 
diff --git a/aio/tools/ng-packages-installer/index.spec.js b/aio/tools/ng-packages-installer/index.spec.js
index 561c09e7c1..f205947380 100644
--- a/aio/tools/ng-packages-installer/index.spec.js
+++ b/aio/tools/ng-packages-installer/index.spec.js
@@ -58,7 +58,7 @@ describe('NgPackagesInstaller', () => {
         '@angular/core': {
           parentDir: packagesDir,
           packageJsonPath: `${packagesDir}/core/package.json`,
-          config: { peerDependencies: { rxjs: '5.0.1' } }
+          config: { peerDependencies: { 'some-package': '5.0.1' } }
         },
         '@angular/common': {
           parentDir: packagesDir,
@@ -112,7 +112,7 @@ describe('NgPackagesInstaller', () => {
         },
         devDependencies: {
           '@angular/compiler-cli': `file:${toolsDir}/compiler-cli`,
-          rxjs: '5.0.1',
+          'some-package': '5.0.1',
           typescript: '^2.4.2'
         },
         __angular: { local: true }