diff --git a/docs/6-gridfs.md b/docs/6-gridfs.md
index 15746a8..8c6ebc4 100644
--- a/docs/6-gridfs.md
+++ b/docs/6-gridfs.md
@@ -27,7 +27,7 @@ flysystem:
                 bucket: 'fs'
 ```
 
-## Full configuration
+## With a Full Configuration
 
 To initialize the GridFS bucket from configuration, set the `mongodb_uri` and `database` options, others are optional.
 
@@ -55,7 +55,7 @@ MONGODB_URI=mongodb://127.0.0.1:27017/
 MONGODB_DB=flysystem
 ```
 
-## With bucket service
+## With a Bucket Service
 
 For a more advanced configuration, create a service for
 [`MongoDB\GridFS\Bucket`](https://www.mongodb.com/docs/php-library/current/tutorial/gridfs/):
diff --git a/src/Adapter/Builder/GridFSAdapterDefinitionBuilder.php b/src/Adapter/Builder/GridFSAdapterDefinitionBuilder.php
index dfc1f1d..cb6be84 100644
--- a/src/Adapter/Builder/GridFSAdapterDefinitionBuilder.php
+++ b/src/Adapter/Builder/GridFSAdapterDefinitionBuilder.php
@@ -56,29 +56,34 @@ protected function configureOptions(OptionsResolver $resolver): void
     protected function configureDefinition(Definition $definition, array $options, ?string $defaultVisibilityForDirectories): void
     {
         if (isset($options['doctrine_connection'])) {
-            $bucketDefinition = new Definition(Bucket::class);
-            $bucketDefinition->setFactory([self::class, 'initializeBucketFromDocumentManager']);
-            $bucketDefinition->setArguments([
+            if (isset($options['mongodb_uri'])) {
+                throw new InvalidArgumentException('In GridFS configuration, "doctrine_connection" and "mongodb_uri" options cannot be set together.');
+            }
+            $bucket = new Definition(Bucket::class);
+            $bucket->setFactory([self::class, 'initializeBucketFromDocumentManager']);
+            $bucket->setArguments([
                 new Reference(sprintf('doctrine_mongodb.odm.%s_document_manager', $options['doctrine_connection'])),
                 $options['database'],
                 $options['bucket'],
             ]);
         } elseif (isset($options['mongodb_uri'])) {
-            $bucketDefinition = new Definition(Bucket::class);
-            $bucketDefinition->setFactory([self::class, 'initializeBucketFromConfig']);
-            $bucketDefinition->setArguments([
+            $bucket = new Definition(Bucket::class);
+            $bucket->setFactory([self::class, 'initializeBucketFromConfig']);
+            $bucket->setArguments([
                 $options['mongodb_uri'],
                 $options['mongodb_uri_options'],
                 $options['mongodb_driver_options'],
                 $options['database'] ?? throw new InvalidArgumentException('MongoDB "database" name is required for Flysystem GridFS configuration'),
                 $options['bucket'],
             ]);
-        } elseif (!$options['bucket']) {
+        } elseif ($options['bucket']) {
+            $bucket = new Reference($options['bucket']);
+        } else {
             throw new InvalidArgumentException('Flysystem GridFS configuration requires a "bucket" service name, a "mongodb_uri" or a "doctrine_connection" name');
         }
 
         $definition->setClass(GridFSAdapter::class);
-        $definition->setArgument(0, $bucketDefinition ?? new Reference($options['bucket']));
+        $definition->setArgument(0, $bucket);
         $definition->setArgument(1, $options['prefix']);
     }
 
diff --git a/tests/Adapter/Builder/GridFSAdapterDefinitionBuilderTest.php b/tests/Adapter/Builder/GridFSAdapterDefinitionBuilderTest.php
index 0c1d9e3..8f82cb3 100644
--- a/tests/Adapter/Builder/GridFSAdapterDefinitionBuilderTest.php
+++ b/tests/Adapter/Builder/GridFSAdapterDefinitionBuilderTest.php
@@ -18,6 +18,7 @@
 use MongoDB\Client;
 use MongoDB\GridFS\Bucket;
 use PHPUnit\Framework\TestCase;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
 
 class GridFSAdapterDefinitionBuilderTest extends TestCase
 {
@@ -64,6 +65,37 @@ public function testCreateDefinition($options)
         $this->assertSame(GridFSAdapter::class, $this->createBuilder()->createDefinition($options, null)->getClass());
     }
 
+    public function provideInvalidOptions()
+    {
+        yield 'empty' => [
+            [],
+            'Flysystem GridFS configuration requires a "bucket" service name, a "mongodb_uri" or a "doctrine_connection" name',
+        ];
+
+        yield 'no database with mongodb_uri' => [
+            ['mongodb_uri' => 'mongodb://127.0.0.1:27017/'],
+            'MongoDB "database" name is required for Flysystem GridFS configuration'
+        ];
+
+        yield 'both doctrine_connection and mongodb_uri' => [
+            ['doctrine_connection' => 'default', 'mongodb_uri' => 'mongodb://127.0.0.1:27017/'],
+            'In GridFS configuration, "doctrine_connection" and "mongodb_uri" options cannot be set together.'
+        ];
+    }
+
+    /**
+     * @dataProvider provideInvalidOptions
+     */
+    public function testInvalidOptions(array $options, string $message)
+    {
+        $builder = $this->createBuilder();
+
+        $this->expectException(InvalidArgumentException::class);
+        $this->expectExceptionMessage($message);
+
+        $builder->createDefinition($options, null);
+    }
+
     public function testInitializeBucketFromDocumentManager()
     {
         $client = new Client();