diff --git a/composer.json b/composer.json
index d215adc..ec9a64e 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     "require-dev": {
         "composer/composer": "~1.0",
         "jakub-onderka/php-parallel-lint": "~0.8",
-        "mikey179/vfsStream": "~1.2",
+        "mikey179/vfsstream": "~1.2",
         "phpunit/phpunit": "~5.6",
         "squizlabs/php_codesniffer": "~2.0"
     },
@@ -32,11 +32,14 @@
         "psr-4": {"DrupalComposer\\Composer\\Tests\\": "tests"}
     },
     "scripts": {
+        "test:unit": "phpunit --log-junit=reports/unitreport.xml --coverage-text --coverage-html=reports/coverage --coverage-clover=reports/coverage.xml",
+        "phpcs": "phpcs --encoding=utf-8 --standard=PSR2 --report-checkstyle=reports/checkstyle-phpcs.xml --report-full --extensions=php src/* tests/*",
+        "phpcbf": "phpcbf --standard=PSR2 --extensions=php src/* tests/*",
         "test": [
             "composer validate --no-interaction",
             "parallel-lint src tests",
-            "phpunit --log-junit=reports/unitreport.xml --coverage-text --coverage-html=reports/coverage --coverage-clover=reports/coverage.xml",
-            "phpcs --encoding=utf-8 --standard=PSR2 --report-checkstyle=reports/checkstyle-phpcs.xml --report-full --extensions=php src/* tests/*"
+            "@test:unit",
+            "@phpcs"
         ]
     }
 }
diff --git a/src/DrupalInfo.php b/src/DrupalInfo.php
index 0783395..729b4f4 100644
--- a/src/DrupalInfo.php
+++ b/src/DrupalInfo.php
@@ -147,8 +147,13 @@ protected function doWriteInfoFiles(PackageInterface $package)
      */
     protected function doRollback(PackageInterface $package)
     {
-        $writer = $this->getWriter($package);
-        $writer->rollback();
+        if ($writer = $this->getWriter($package)) {
+            $writer->rollback();
+        } elseif ($this->io->isVerbose()) {
+            $this->io->write(
+                '<info>No info files found for ' .$package->getPrettyName() . '</info>'
+            );
+        }
     }
 
     /**
diff --git a/tests/DrupalInfoTest.php b/tests/DrupalInfoTest.php
index b5840d7..8665a30 100644
--- a/tests/DrupalInfoTest.php
+++ b/tests/DrupalInfoTest.php
@@ -260,4 +260,54 @@ public function testRollbackRewrite()
             $this->assertNotContains($info_pattern, $contents);
         }
     }
+
+    /**
+     * Verifies a warning if rollback is attempted without .info file.
+     *
+     * @covers ::rollbackRewrite
+     */
+    public function testRollbackNoInfo()
+    {
+        // Generate test files.
+        $this->generateDirectories();
+
+        // Add the .info file that will be removed.
+        $files = [
+            $this->getDirectory() . '/module_missing_info',
+        ];
+
+        $package = $this->prophesize(PackageInterface::class);
+        $package->getType()->willReturn('drupal-module');
+        $package->getPrettyName()->willReturn('My Module');
+        $package = $package->reveal();
+        $packages = [$package];
+
+        $local_repository = $this->prophesize(WritableRepositoryInterface::class);
+        $local_repository->getPackages()->willReturn($packages);
+
+        $manager = $this->prophesize(RepositoryManager::class);
+        $manager->getLocalRepository()->willReturn($local_repository->reveal());
+
+        $installer = $this->prophesize(InstallerInterface::class);
+        $installer->getInstallPath($package)->willReturn($this->getDirectory() . '/module_missing_info');
+        $location_manager = $this->prophesize(InstallationManager::class);
+        $location_manager->getInstaller('drupal-module')->willReturn($installer->reveal());
+
+        $this->composer = $this->prophesize(Composer::class);
+        $this->composer->getRepositoryManager()->willReturn($manager->reveal());
+        $this->composer->getInstallationManager()->willReturn($location_manager->reveal());
+        $this->composer->getConfig()->willReturn(null);
+
+        // Ensure an error is logged.
+        $this->io->isVerbose()->willReturn(true);
+        $this->io->write('<info>No info files found for My Module</info>')->shouldBeCalledOnce();
+
+        $this->fixture->activate(
+            $this->composer->reveal(),
+            $this->io->reveal()
+        );
+
+        $event = $this->prophesize(Event::class);
+        $this->fixture->rollbackRewrite($event->reveal());
+    }
 }
diff --git a/tests/InfoFileTrait.php b/tests/InfoFileTrait.php
index 6b972b3..6ec47ec 100644
--- a/tests/InfoFileTrait.php
+++ b/tests/InfoFileTrait.php
@@ -34,6 +34,9 @@ public function generateDirectories()
                 'module_with_version' => [
                     'module_with_version.info.yml' => "name: module with version\nversion:8.x-1.0-alpha4",
                 ],
+                'module_missing_info' => [
+                    'README.md' => 'A README file.'
+                ],
             ],
             // Drupal 7.
             'drupal7' => [