diff --git a/src/CollectionManager.php b/src/CollectionManager.php
index 5dd1e9f..e32420c 100644
--- a/src/CollectionManager.php
+++ b/src/CollectionManager.php
@@ -89,7 +89,7 @@ public function create(string $name, array $options = []): ResultInterface
         $defaults = [
             'num_shards' => 1,
             'router_name' => 'compositeId',
-            'nrt_replicas' => 1,  // alias: replication_factor
+            'nrt_replicas' => 1,
             'tlog_replicas' => 0,
             'pull_replicas' => 0,
 
@@ -112,7 +112,7 @@ public function create(string $name, array $options = []): ResultInterface
             ->setNumShards($options['num_shards'])
             ->setRouterName($options['router_name'])
 
-            ->setNrtReplicas($options['nrt_replicas'] ?? $options['replication_factor'])
+            ->setNrtReplicas($options['nrt_replicas'])
             ->setPullReplicas($options['pull_replicas'])
             ->setTlogReplicas($options['tlog_replicas'])
 
diff --git a/tests/Integration/CollectionManagerTest.php b/tests/Integration/CollectionManagerTest.php
index 4f90b56..1c6a6cc 100644
--- a/tests/Integration/CollectionManagerTest.php
+++ b/tests/Integration/CollectionManagerTest.php
@@ -33,7 +33,7 @@ public function it_creates_collection_with_options()
     {
         $this->manager->create('foo', [
             'num_shards' => 2,
-            'nrt_replicas' => 2,  // alias: replication_factor
+            'nrt_replicas' => 2,
             'pull_replicas' => 1,
             'tlog_replicas' => 1,
             'router_name' => 'compositeId',